Gmail

My Left Arm for a Gmail Account
Wired News - What's an invitation for a Gmail account worth?

If you have an invitation to open an account on Google's new e-mail service, you could sell it on eBay for as much as $60. But if cash is a little too prosaic for you, your Gmail invitation could net you 4 pounds of fresh fudge, some Jewish mystical knowledge, a photo of a wife and a girlfriend kissing, a tarantula, Paris Hilton's phone number or any one of more than 1,000 other options ...
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If you get an invite to join Gmail, grab it while you can still obtain a good gmail.com name!
Who knows? Pretty soon, your gmail name could be worth a lot to the right buyer. This is because gmail accounts will be sold as commodities ... (even though it is against the TOS and I am in no way advocating such a procedure)

Pssst! Wanna buy an invite to Gmail? Try eBay!