UPDATED @ 10:30! Gmail Utilities
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From FW, some Gmail Utilities:
Get Mail - Retrieve Email from your hotmail account to Gmail.
eMail2Pop - Convert AOL and Gmail mail into a standard mail format. This means that you can retrieve their AOL / Gmail mail from your favorite email client.
PGtGM (Pop Goes the Gmail) - A program that sits between the gmail.com web server and your email client, converting messages from web format into your favorite email client.
gExodus - Upload mail from your computer to Gmail.
Gtray - Sits in your system tray bar and will notify you have you have new mail. Also if you double click on it, it will open in a new window and sign in automatically with your gmail username and password.
G-Mailto - Automatically make "mailto" to work with gmail. So if you click on a mailto: link it will open up and have the compose page ready set for you.
Hot Tip
If you ever sent invites and it is lost/deleted, you can always retrieve the codes by looking in your sent folder.