Firefox 3.5 has been released! I've been using it since betas and even the final is faster. Especially if you do a clean install.
Fun tweak to enhance speed:
In your address bar enter: about:config
Search for: jit
One will be set to false, ensure both are set to: True
Restart Firefox and enjoy the speed.
Pages are rendering for me in the blink of an eye. JIT is basically the new TraceMonkey that they've been working on.
Download:
http://www.getfirefox.com/
You can also get it from my Anti-Malware Toolkit.