I'm not sure what Au may or may not have been responsible for, but the Android tablet is the first time I've been wow'd by a Google UX. I'd be more interested in seeing Matias Duarte's picks.
- GMail -- more for the rich use of javascript that a stunning UI. Effective, simple, and performant.
- The main website -- simple, loads quickly, etc.
- Android (Froyo and beyond) -- there are elements I really wish Apple would adopt - widgets, unobtrusive notification system, etc.
Beyond those, I really haven't seen a UI/UX example from google worth being wow'd about.
A serious minus that comes to mind on their UI/UX experience is the way they handle image search now. I'm still on the fence about "instant search"
- Search
- Google Analytics
- Gmail, gmaps, calenders, spreadsheets, etc
- Groups
UX failures: (and yet had pretty decent UI's)
- Buzz
- Wave
Sidenote - TIL about bagcheck.com, looks pretty cool.