In addition to all the cool new features that GMail has (including my personal favorite Mail Goggles that stops you from sending crazy emails late at night) it has release two new ones.
1) Tasks — useful but currently I use Toodledo. Which allows you to take notes, file things, set goals, and create subtasks. And if you go all out on Toodledo you can actually have Toodledo tell you what to do. Good effort GMail, but I’ll stick with Toodledo (which also integrates with your calendar).
2) SMS Text Messaging from your GMail. Wonderful! Now I can text message without having to use my tiny little keyboard.
Interested in finding out more: http://mail.google.com/mail/help/about_whatsnew.html