Google Drive's shortcut in Windows 7/Vista shows up in your Favorites folder, while in Windows XP, it shows up in your My Documents folder. The shortcuts are easy enough to use, but if you find using a specific drive letter to be more convenient, there's an easy way to map one to your Google Drive account.
If you're comfortable using the command prompt, you can use the DOS command: subst. A better and easier way to create the drive association is using a small program called Visual Subst. It's basically a GUI front-end to the subst command.

