So I decided to take my first shot at a plugin for boxee with the Adult Swim site which can be downloaded here:
Adult Swim Plugin.
It turned out to be a bit tricky (for me at least) in that episodes are broken up into segments rather than single streams. So to watch a full episode in boxee you'd have to play the first 5-10 minute segment, select the next segment and play it, then the next, etc. I opted to go a different route which basically makes a video playlist of the segments and plays them in succession but this causes a few issues:
-Watched episodes don't show up in your profile stream.
-When you select an episode you don't get a "Play, Read more" screen. It just starts playing.
But at least it plays back in full. I can switch it to the non-playlist way of watching if enough people want. You can chalk this up to my limited Boxee development knowledge right now.