To get Firefox, visit this site. If anybody is switching and wants some help with anything or wants some extension suggestions, PM me and I'll be more than happy to help.
I too love open source and use OOo (OpenOffice.org) for about 50% of my work. I've also tried GIMP, Thunderbird, Sunbird and a few other open source projects. For the most part, they're very competitive with their closed source counterparts.
As you can see in my avatar, I'm also a Google fan and try out anything they release. Google Earth (now used by CNN) is incredible and Google keeps coming out with more and more programs and services. I hope the rumors of nationwide Wi-Fi come true...