Applets
There have been lots of cool applets popping up, especially since the python bindings were committed a week or so ago.
Stacks
last.fm
Main menu
Launchpad
The move to launchpad has also created some very cool branches of Awn by other people which focus on new ideas, or new ways to implement existing ones. Below are two examples, the first being the libawn-effects branch, which migrates a lot of effects code from Awn to libawn, wraps a nice api around them, and adds a few more fancy effects:

Both are quite stable and are in line for a merge :-)
*Update* As usual, the videos have been stripped out, so if you want to see them you'll have to click on the post title above.