I'm definitely a FireFox convert, it's great for Windows too since IE is so crap it's unbeliveable! It seems like FireFox is impenetrable to spyware I barely need to run ad-aware anymore (it detected just 2 ad cookies on my comp- that was it, and they probably came from IE!)
I wish that Firefox was used as the default browser at Uni, I run scans and sometimes there are more than 400 spyware objects that stupid (sports science

) students have installed! I'll never go back to IE on my main comp, even after SP2 with the proposed improvements that Firefox already does and more.