I haven't noticed this before, but when I went to sync a movie to my iPod, the "syncable" movie are bold and the "unsyncable" ones are greyed out. This saves me some confusion with all the movies I have encoded for AppleTV vs iPod.
Running 3.0 beta 2 on iTouch 2G, iTunes 8.1.1

Running 3.0 beta 2 on iTouch 2G, iTunes 8.1.1