Although Firefox 3.1 most probably won't be released in Q1 of 2009 fortunately we have another browser to play with: Apple has just released a public beta of Safari 4.
I'm currently writing this post using it and so far it looks promising to me; it seems Apple really implemented what is described on the what's new page: Developer tools, Cover Flow and of course exceptional performance!
Furthermore also Windows users have it finally in a native look!
If you're an experienced user give it a try and let us know how your application behaves in it - with and without Selenium - it is very important for us to have early access to the feedback of our community! 
The browser itself certainly is an eye opening improvement over previous versions - especially the top sites option where you have the at-a-glance viewing of the top 12 sites you've visited and the iTunes-like jukebox view.
However, I can't run my Selenium test against it. The RC window appears (with command history) but the separate window that usually appears when I run Firefox doesn't appear with Safari 4 beta. Any ideas?
Thanks,
Shawn Bertrand