Some other bloggers already mentioned it that Scott Handelsman has updated a tool list. This list called "Scott Hanselman's 2005 Ultimate Developer and Power Users Tool List" contains an impressive list of tools containing something for everybody.
You have to take a look at the following:
Lutz's Reflector and it's AddIns - The tool that changed the world and the way we learn about .NET. Download it, select and interesting method and hit the space bar. Take the time to install the Add-Ins and check out the amazing static analysis you can do with things like the Diff and Graph.
TestDriven.NET (was NUnitAddIn) - The perfect integration of Unit Testing with Visual Studio.NET. Right click and "Run Test." The output window says "Build" then switches to "Test." The best part, though, is "Test With...Debugger" as a right click that automatically starts up an external process runner, loads and starts your test. Compatible with NUnit, MBUnit and Team System.
Eric J Smith's CodeSmith - Oh, yes, it's much more than just a Strongly Typed Collection Generator. It's a complete code-generation engine with an ASP.NET-like syntax. Very extendable, very powerful, very affordable. And all is right with the world. I've used it to generate THOUSANDS of lines of code. There's a learning curve, but the benefits are immense. It's worth the download just for the Strongly Typed Collection code from Chris Nahr.
ASP.NET Development Helper - Nikhil, a dev lead on ASP.NET 2.0, created this wonderfully elegant developer helper that plugs into IE and gives you lots of insight into what's happening in ASP.NET while you develop. Want a FireFox version? Sure.
And many more :)
http://www.hanselman.com/blog/ScottHanselmans2005UltimateDeveloperAndPowerUsersToolList.aspx