Google E-mail Uploader Imports Your Mac Mail
If you want to move all of your old mail; whether it's sitting around in Outlook, Hotmail, or Apple's Mail app to Gmail, Google has simple solutions for each scenario. Windows users have had a one-stop desktop app for uploading e-mail since 2008, and Web mail has been easily importable thanks to Gmail's ability to pull in POP. Now Google has rounded out the line up (well, kind of, but Linux didn't want to play anyway) by offering a mail uploader tool for Macs.
The one limitation -- the uploader apps can only import to Google Apps accounts, not standard Gmail. [From: Google Mac Blog]