Jelle Druyts

I've said before that I'm not a "linking out" kinda guy, but these two tools are just too cool not to mention.

CR_Documentor

CR_Documentor is a free addin for Visual Studio (works on Visual Studio 2003 and 2005!) that shows a live preview of how the XML documentation under your cursor would look like in a help file.

I'm a real documentation freak, so this is pure heaven for me!

PowerTrace

PowerTrace is a free library that contains the TerminalTraceListener class, which "opens a port and allows you to connect to your app through Telnet so you can watch your traces in the lab or even across the globe" (quoting the November 2005 edition of MSDN Magazine's Bugslayer column).

I think that's a pretty clever concept: you're not wasting any disk space with trace files, in stead you can connect to a running app when there's trouble. You don't receive a history of the last x minutes or trace lines when you login though (which you will probably need to properly diagnose the problem) but it's still a great idea to add this functionality to production systems.