If you use Sprint Navigation, I just discovered that you can use the browser plug-ins from Telenav. I wasn't quite sure, so I tried it, and it works great.
Go to
Sprint Navigation's site and make sure you can log in. Your pin is the last four of your phone number if you haven't changed it. I don't know if you need to do this step, but this is what I did.
Then go to
Telenav's site and log in with the same info. Install the Browser Plug-ins of your choice and use away! You basically highlight an address and click the toolbar button.
After you save the address, you'll need to refresh the favorites in Sprint Nav.