For those of you who want to be all-kinda snazzy, there are some specially optimized versions of Firefox out. Those with newer computers that have Pentium 4 or Athlon XP processors should get this one. Those with older cpus (Pentium 3 or Pentium 2's) should get this version (these cool builds are being done by Moox). I think I would install the official release first, and then install the optimized version over top.
Also, Mono (the opensource .NET replacement) came out in Beta3 yesterday. I haven't used it a lot yet, but between it and Sharp Develop, things in the open-source C# and .net programming world are getting peachy.