Smart add-in to Visual Studio 2005/2008 with useful tool windows, refactoring metods, visualizers and code generators. It can really save you a lot of time and reduce the amount of boring coding!
jumping to proper line of code, based on log entry (special formatting acquired, however several patterns are dynamically detected and applied: Debug Output View)
when class and method name is given (C++/C#/VB)
when global function name detected (C/C++)
visualization of common objects during debugging
XML documents
images and image lists, color objects
COM objects
edition of system registry (see more at: Registry View)
useful especially during tests of modules with configuration based on system variables, eliminating the need of the Visual Studio (for Software Testers) relaunch to get them updated!
for current process (i.e.: Visual Studio itself and all other launched by it)