New Features Introduced in DSM 3.0

Personalized Web Desktop:

» The new DiskStation Manager Desktop is redesigned to provide an easy-to-use and intuitive user
   interface. The personal Desktop keeps users' applications and functions easily accessible. Besides,
   it's customizable so that users can change the wallpaper and background color on their
   own preference.
» Main menu is comprised of control panel and all applications, from which users can freely drag the
   icons to Desktop, or remove it at a later time. The application icons in main menu are available
   to users at all times.
» Control panel consolidates all system settings where users can easily modify both software
   and hardware settings. Home button on the navigation bar provides instant access back to
   the homepage of control panel.
» Help browser is added to provide direct access to a comprehensive library of all functions’
   introduction and instructions. Home button on the navigation bar provides instant access
   back to the homepage of Help.
» Search field on both task bar and navigation bar on Control Panel helps users to look through
   applications or Help at the same time.
» Search field is added to task bar on User, Group, and Domain Privileges to assist admin locating
   the user accounts and group with ease and efficiency.
» Uploading queue on task bar provides quick information of the latest uploading tasks.
» File task monitor allows users to check the progress of all uploading and background tasks.
» System Information and Resource Monitor help users to track the health status of their
   DiskStations.
» Storage Manager is added to help users easily organize their hard drives and volumes, as
   well as iSCSI LUN and target.
» Backup and Restore is added to provide centralized management for all your ongoing backup tasks.
» Package Management allows users to quickly enable or disable any service provided by quick
   install applications packed and tested by Synology.
» Notification window on task bar alerts users when a background task is completed.
» Show Desktop button allow users to minimize all application windows to the task bar, and
   provides instant access to restore all running applications.

Multitasking:

Users can run multiple applications simultaneously on Desktop and switch between them instantly. Multitasking support saves users from the constant wait of refreshing the whole webpage. All running applications are placed on the task bar.

File Browser:

» File Browser provides easy file navigation on Desktop.
» Drag-and-drop between two different file browsers to copy or move files is now supported and
   provides easy file management.
» File uploading in the background is supported therefore allows users to switch to
   another application without interrupting.
» File browser now replaces File Station of the default management UI port. File Station on the
    customized port remains the same.

Windows Access Control List (not available on 7-series, DS108j, DS109j, and DS209j)

» Windows Access Control List (ACL) is now supported to enhance data security and the compatibility
   with Windows®. Users can easily set up the Windows ACL privileges on share folders and
   files on DiskStation in a Windows environment.
» Allow access permissions to be granted or denied for every file object, providing much
   finer-grained access control and a greater degree of selectivity.
   13 security attributes are supported to offer a variety of security levels.

Surveillance Station 5:

» 253 more IP camera models from Sanyo, Toshiba, Cisco, AirLive, Messoa, TP-Link, Etrovision,
   and other brands are now supported. View the complete list here.
» ONVIF and PSIA support provides the compatibility between Surveillance Station 5 and
   ONVIF and PSIA compliant IP cameras.
» The whole user interface is revamped to provide easy navigation and easy-to-use user
   experience. Larger viewable area is available in Live View and Timeline.
» 25 channels & 36 channels layout are now added in Live View to offer users who utilize
   the centralized management on Surveillance Station with more options.
» Non-sync mode in Timeline event player allows users to view events from up to 4 IP cameras
   simultaneously in a more efficient way.
» Time slicing is now added to Event Player to split the playing event into four equal-length
   clips to help users quickly glance through the whole event.
» Guard wizard is added to guide users through the process of setting up the patrol and Guard
   tasks with the IP cameras.
» Event filter is enhanced with new layout to help users locate the events within a timely fashion.
» Log filter is now added to help users quickly spot the log event they are looking for.

iPhone App (Free download on Apple®App Store):

DS photo is enhanced and renamed to DS photo+. It allows users to easily browse through photos and videos on Photo Station with the thumbnail slider on the go, including interactive with friends through the photo or video comments in real time. Users can easily find out the location where the photo is taken with the built-in Google map, and they can download and store the pictures onto their iPhone/iPod touch and enjoy the flashbacks anytime anywhere. In addition, users can upload photos and videos from their iPhone/iPod touch straight to Photo Station with DS photo+.

Android Phone Applications (Free download on Google® Android Market):

» DS cam allows users who own an Android phone to live view IP cameras managed on Surveillance
   Station, take snapshots, and view recorded events stored on their Surveillance Station
   whenever network connection is available.
» DS photo+ allows users who own an Android phone to easily browse through photos and videos on
   Photo Station with the thumbnail slider on the go, including interactive with friends
   through the photo or video comments in real time. Users can easily find out the location
   where the photo is taken with the built-in Google map, and they can download and store the
   pictures onto their Android phones and enjoy the flashbacks anytime anywhere. In addition,
   users can upload photos and videos from their Android phone straight to Photo Station with
   DS photo+.
» DS audio allows users who own an Android phone to stream their own music stored on DiskStation
   on the go. Besides, the Remote control feature provides intuitive interface to browse
   through Audio Station music tank, it allows users to remote control Audio Station music
   playing on the attached speakers conveniently.

WebDAV:

Web-based Distribution Authoring and Versioning is added to allow users to manage and edit files on DiskStation remotely with the support of content metadata and overwrite protection. It helps a disperse group of users around the world work on the same project as a team, which will greatly increase the effectiveness of group collaboration.

IPv6 (not available on 7-series, DS108j, and DS109j):

» Internet Protocol version 6 (IPv6) and IPv4 networks are now both supported.
» IPv6 Tunnel is supported to encapsulate IPv6 packets for delivery across an IPv4 infrastructure.

You may want to take a look at the forum post of the DSM 3.0 Webinar Q&A. It covers a lot, but I will only cover portions of the Q&A in the review.