Avoiding being ripped off on Craiglist

Nice wiki with some helpful tips thanks to Wired on How to spot a fake listing on Craiglist. Some of the advice is common sense for those of you who use eBay or any other reseller/auction site out there. One of the ones I think is really worth stressing:

...examine the seller's user feedback. If the seller has 100 unique messages attesting to his/her reliability, it is likely that he/she is reliable. If the seller has many negative comments attesting to his/her failure to ship the item on time, then insist on using an escrow service (such as I-escrow) to ensure that you will get what you pay for.

I don't use an escrow service, if the seller has no feedback or too many negative feedback ratings, I take a pass but if it's an item you feel you just have to have, an escrow service is better than taking a risk.