I am a super huge ebay junkie. I have purchased a lot of great stuff through ebay, and it is especially cool if you are a collector.
Most of the stuff I have bought through eBay goes towards my random collections. i went through a "zebra" phase where everything I owed just had to be zebra print or else I would go nuts. I went through a "wonder woman" phase and bought a bunch of cool collectibles. I have also found some really cool books and deltasig stuff on there as well.
I have never bought anything expensive like a camera, or any type of electronic equipment on ebay though. I am still kinda wary about buying things like that on the 'net from strangers. I guess I'm just scared it won't work like it is supposed to. For all that "good stuff" I go to Best Buy
One of the best ways to safeguard yourself from fraud on Ebay is to check out the seller's profile. If they have ANY negatives, be sure to read up on it and see if maybe the negative comments were just in retaliation to a comment they might have made. Most GOOD sellers on ebay would more than likely be more than willing to correct a problem should you have a problem with it.