Jonathan Payne has a couple of handy Visual Studio plugins on his Visual Studio Stuff page:

• VSFileFinder is an alternate way to find files in your solution. Rather than navigate projects and folders, simply type some letters, and a list of all files containing the text appear in a list box. Quick and simple.
• VSTabs is a replacement for the built-in document tabs. The good thing about it is that it groups a .h and .cpp file together (with the long part of the name only appearing once, to save space). This one is harder to adopt, because it removes some things I like, like being able to drag tabs to re-order them.