Some useful Visual Studio Tips from the The top ten most visited tips blog on MSDN.

I particulary find useful the tip on the Find Combo Box. The Find Combo Box may be used a a mini Command Window so you can do something like:
1. Ctrl-D
Keyboard shortcut to get to the Find Combo Box.
2. > open [file]
Open any file in the current solution. The great thing is that intellisense works here for completing the filename.