I have six invitations for Gmail accounts.
First six e-mails sent to dtasman (ay - tee) gmail (dee - oh - tee) com gets them. Include your first and last name.
If you're looking for an alternative to Yahoo!, here it is! Cyburbians using Yahoo! as their primary personal e-mail account will be given priority.
(Please note I don't use Gmail as my primary personal e-mail address; I'm just testing the waters. Looks promising, though.)