Firefox 3 released today!
I've had the test release on my Mac at home (thanks to lots of freezes in 2) and it's been very nice. Definitely faster (though, of course, I've also got fewer extensions installed, since not all the extensions work in 3 yet.) Here's the most comprehensive guide to Firefox 3, though there are also plenty of reports available on the web.
I'll definitely see what I can turn up for research and education related add-ons/extensions for a future post.
Update: After a couple of hours, I finally managed to get to the download site, and downloaded a copy to my work computer. Unfortunately, the Add-Ons site is down (presumably overloaded), so I can't get my updates for things like the del.icio.us add-on. Oh, well, better luck tomorrow.
Another Update: I just checked the Firefox site, and they are still having trouble with the download displaying version 2. You might want to wait until tomorrow!