I'll add:
* For Visual Studio 2003, I heartily recommend ReSharper 1.5: http://www.jetbrains.com/resharper/
It's a coding assistant that does, well, IDE things that VS 2003 left out.

VS 2005 has a lot of (but not all of, and not some of the most useful) features built-in, but ReSharper 2.0 is still in development.

* I find it odd that the IE webdev toolbar is mentioned, but not any of the Firefox equivalents. Who webdevs just for IE anymore?

* Source control yes, SourceSafe: NO! Unless you're a one man shop, "no atomic checkins" means "blood, sweat and tears trying to figure out who changed what when, and why."

heh well I generally deal with writing framework style libraries to be honest ... Occasionally I have need to write some neat little doodad for the web but frankly its not my cup of tea. That's why I asked for others in a more distributed development group to post their top tools as well :)