Opening the current editing file's parent folder in explorer from Visual Studio

Run Visual Studio.
Go to "Tools | External Tools | Add" and use the following settings for the new tool.

Title:       Show in &Explorer
Command:     c:\windows\explorer.exe
Arguments:   /select,$(ItemPath)

done.. you can now open the folder containing the currently editing file in explorer. You can assign keyboard shortcut for this command if you want to.

For further questions read this
http://msdn2.microsoft.com/en-us/library/9814d200(VS.80).aspx
http://msdn2.microsoft.com/en-us/library/80cb6ks3(VS.80).aspx