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Windows only: Explorer extension Lammer Context Menu adds a number of very useful features to the right-click menu, from standard stuff like Copy Path all the way to wild cards, batch rename, and mounting virtual drives.
Once you've installed the extension, you can simply right-click on a file or folder to access the new utilities—you can open a command prompt, copy the path, search, mount folders as a virtual drive, register DLL files, or use the very useful feature to select all files of the same type in the current folder. There's also some more advanced dialogs, like the path operations screen where you can move, copy, delete based on wildcards, or the batch rename files dialog.
Lammer Context Menu is a free download for Windows, works in both 32-bit and 64-bit versions of Windows, and is compatible with UAC in Windows 7 or Vista.
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You can get Lammer here
http://sites.google.com/site/lammersoft/lammer-context-menu