Here is a quick little tip I just learned that I use all of the time now. In Windows Vista, if you hold down the Shift key and right click on a file, a new option appears in the context menu: "Copy As Path"
This will copy the full path of the file you select to the clipboard. This is very handy for pasting file paths into a command prompt window. Why this option is so hidden, I don't know.
I hope this saves you some time.