While I don't have any specific additions off the top of my head, I also use CCleaner and they post monthly updates with a host of bug fixes and additions. It would be nice if AU had regular updates as well. Gives a nice "warm fuzzy" that it's keeping up with the ever-changing software landscape.
Here's CCleaner's latest version history:
v3.03.1366 (25 Jan 2011)
- Added K-Meleon browser support.
- Added Rockmelt browser support.
- Added Chrome Plus browser support.
- Added Saved Password cleaning for all browsers.
- Added cleaning for multiple profiles in Google Chrome.
- Added Recent Search History cleaning for Safari.
- Added cleaning for Adobe Acrobat 9.0 and 10.0, Shockwave 10 and 11, Daemon Tools, Compare It! and Microsoft Search Helper Extension.
- Improved Autocomplete Form History cleaning for IE9.
- Improved Saved Form Information cleaning for Chromium based browsers.
- Improved Internet History cleaning for Opera.
- Improved Internet Cache cleaning for Firefox.
- Improved cleaning for Silverlight and Adobe Reader.
- Improved Office 2003 and XP to prevent removal of autocorrect settings.
- Added more Windows MRU cleaning rules.
- Added Belarusian translation.
- Minor UI tweaks and fixes.
Full version history: