- Campaign Management: you can now pause/resume ads/keywords. There's more geo-targeting options, and performance reporting has gotten enhanced.
- Editorial Improvements: You'll know much sooner why your ad has not been approved and get inline notifications on exceeding limits imposed by the system.
- User Management: You can now add more than one user!
- Content Ads: In the US only, you can get keyword suggestions/performance estimates for Content Ads
Initial feedback is that this is good stuff, but many wonder when adCenter will catch up to AdWords.
Forum discussion continues at WebmasterWorld.