While the online games portal is neat, this isn't going to be a replacement for Steam or Pogo.com. Below are a few images of what you would expect to find. The menu is fairly easy to navigate and the games load quickly.
Lastly, you'll be able to use the built-in File Manager or the Photos application to view your photos in the same fashion as Apple TV and Windows Media Center. The Photo application allows you to browse the local user folders, local hard drives as well as USB devices - it did not allow for network browsing.
For additional media functionality ASUS has included their Home Theater Gate software. This is a more robust version of the Express Gate software that runs under Windows. As you can see by the image below, it looks (and runs) very much like Microsoft Media Center and Apple's Front Row. The only real perk to this is you can add network shares...and it has a really nice interface.
Once we got everything loaded, patched and tweaked, we fired up CPU-Z to see what was going on under the hood of the AT3IONT-I Deluxe running at stock speeds.
You can see that no matter what we did, the memory would only run at 533MHz - but the system does correctly identify it (see page 13 for update on overclocking).
Since the ION chipset is only running in 2D mode, it is clocked down to 200MHz and using slightly more than 1GB of our system memory - still more than enough power for home media tasks.