http://mail.google.com/mail/help/about_whatsnew.html

http://www.mattcutts.com/blog/keep-it-coming-gmail/

What's new on Gmail?
Just Launched!

Auto-save
We spent 20 minutes writing this entry, and then the browser crashed. Good thing there's auto-save. It saves. Automatically.

Export contacts
Export your Gmail Contacts and save them in a file for back-up or to use in another account or service–great if you're using Gmail's free POP access. Learn more

I like the feature of From option from any other email address [ofcourse after verification]

I like the gmail as it has tremendous nice features. I like rich text formatting and immediate reply compose window is opening to give reply. And I like customization feature for "From" on outgoing messeges also.

Shame I've now had my account locked out twice for using the mozilla gmail notifier!