If you’re budget conscious, just head on over to the Android Market and pick up a free app called SwiFTP. This app runs an FTP server on your phone. The interface is minimalist and the options are scarce, but it gets the job done. Start the server and input the local FTP address into your favorite file browser on your computer. We found performance in Windows Explorer to be a bit slow, but using a standalone FTP program like FileZilla (also free) works great as well.
Whichever method you go with, that USB cable is going to see a lot less use. Let us know if you try this, and how it works out.