Saw a funny post on this blog earlier,
and thought maybe a lot of people don’t know about the tools in
SDK. One of them is wincv, and if you don’t know about wincv.exe,
you’ve been missing out. If you use reflector, then you haven't been missing out, and I like reflector better, personally.
Wincv is
the windows forms class viewer. It lets you find information
about a class simply by typing in a search string. If I launch
wincv (location in “C:\Program Files\Microsoft Visual Studio .NET
2003\SDK\v1.1\Bin” so it helps to have this in your PATH) and type in
“DateTime”, I get what you see below:

The default assemblies it loads for searching are:
mscorlib.dll, System.dll, System.Data.dll, System.Design.dll,
System.DirectoryServices.dll, System.Drawing.dll,
System.Drawing.Design.dll, System.Messaging.dll,
System.Runtime.Serialization.Formatters.Soap.dll,
System.ServiceProcess.dll, System.Web.dll, System.Web.Services.dll,
System.Windows.Forms.dll, System.XML.dll
For more information, see the MSDN documentation for Wincv.exe