Yep - it's a Craig's List scammer. They send you a fake cashier's check for more than the purchase amount, then ask you to refund the overpayment. Plenty of info on 800notes (30 pages!) regarding this scammer.
CraigsList Nov 01st, 2012
firstname.lastname@example.org just sent two emails in response to two of my ads for artwork on craigslist with the following text:
Hello, do you still have this? When can I come check it out?Shoot me an email back as soon as possible please or you can leave me a message here on my phone number (301) 741-4871,I'm speech disabled though, remember to leave your name and email address when you call.PS: - You can just reply this email, I'm always with my computer
This is a scam to part you with money and property. DO NOT RESPOND TO THE EMAIL.