I woke up today with a Firefox popup on my desktop, notifying that my firefox is now upgraded to Firefox 3 Beta 2. Note that I install firefox beta in my home folder, so, automatic update JustWorks(tm)
See whats new here : http://en-us.www.mozilla.com/en-US/firefox/3.0b2/whatsnew/
What noticable is, at last, the visual refresh for Linux is here!!
And the new addressbar is cool.