Apologies is this has been addressed elsewhere - I didn't find it by searching.
I just finished (re)installing Boxee (and all else via the 'Boxee Bleeding Beta Baby') on my Apple TV (version 3.0.2 if it matters).
Anyway, Boxee now shows my resolution as 720p (1280xsomething). My TV is 1080p (1920xsomething) - and that is rightly displayed in Apple TV's settings. However, as said, in Boxee it is downgraded.
How do I change this? I couldn't find the settings for this inside Boxee.