Here’s the full feature list and link:
Power Twitter adds features to the Twitter Web interface including:
-inline YouTube, Flickr, TwitPic, Google Maps, song.ly, and all sorts of playable/viewable media
-link expansion
-link translation to page titles
-search scoped to a specific user
-custom settings
-@mentions of friends on profile pages
-photo uploading
-link shrinking
-#dailyquestion
-#moods
