New Gmail

So I have a new version of Gmail (maybe everyone does?), but it really doesn’t seem all that different. Anyone know what the deal is?
Update: Ok, I spoke too soon. In addition to the new refinements, the address book is all new. (See this post.)
Update II: The new Gmail is, at best, underwhelming. Other than the new address book, I’m not seeing and productivity or workflow enhancements, which is what I’d hoped would come out. The UI is tighter and the whole product is much faster, both of which are welcome enhancements. But the changes seem to be merely cosmetic, and frankly I think that despite the fact that Gmail is a great product, it’s starting to show its age.
My number 1 feature request would be a “merge contacts” button so I could select 2-3 contacts that are actually a single person and merge them. Apple’s address book does this fairly well and it’s a heck of a useful feature when you’ve got thousands of contacts, some of which are clearly duplicates.
What’s your number 1 request for Gmail?