TextPayMe is a cool new service that allows you to pay other people by just sending a text message. I know I will use this in liu of using PayPal and it works well with Craigslist.
The way it works is you text their service with the phone number of the person you want to pay and the ammount you want to pay. The service then calls your phone and you enter your secret pin into their automated system. You then get a text message as a reciept.
Sign up soon and they will give you a $5 credit. If you do sign up do so via this link so I get a referal credit.