At first one should visit: http://visualstudiogallery.msdn.microsoft.com/. There, lots of useful tools for VS can be found.
For instance today I came across metalscroll. Small but very useful plugin that replaces scrollbar in the VS Editor with a graphics representation of the code - whole source file downscaled to the size of scrollbar (of course a bit wider that the original bar...)
Thanks to the plugin you can easily navigate in the source file - especially if the file has a lot of lines... For example you can show every occurrence of selected text. It is even easier that Ctrl + F.
Another nice powerful tool: devexpress RefactorCPP Very nice and easy to use refactoring tool (and not only that) that will speed up your coding. There is full "PRO" version... but at first I suggest using FREE version which is enough for most cases I think.
There are also PowerToys for Visual Studio as well. Many people suggest installing it as well.