The Roku wont play local area network content but the Apple TV will (at least stuff ripped into mpeg 4, mp4, and h.264 formats). All the artwork comes across to the interface as does any metadata you add.
I'm trying to find a good alternative to the Apple TV.
Basically I bought the Netgear Digital Entertainer Live last year and now seriously regret it because its slow and ugly!
I'm now trying to find a new on that has a nice interface and can play iTunes movies (h.264) that have artwork and chapter markers (and if possible will show the ratings like iTunes does). I'd like it show the artwork as my xbox 360 shows it but I want a dedicated device for my movies not have to keep using my xbox. The movies are all ripped from DVDs and I used MetaX to add the year, artwork and ratings.
Any help would be greatly appreciated.