Let me know how you get on Tom, I looking to use the Apple TV2 with my NAS drive.
I got it installed last night, took me a bit of playing around though.
The main problem that I have is that I can't get it to play .m4v files!
What skins are you using? I found that some make it really laggy.
Have you organised all your films with the thumbnails and so on?
Problem is mate is that I have literally 1000's of files which are also linked with my iTunes library so I don't really want to start playing around with them.
Hopefully a fix will come out soon.
Library mode will automatically download thumbnails and film/episode details.