I've bought/sold/traded everything imaginable on Craigslist. Great site for sure; you just have to be smart.
If you're going to list your phone number in an ad, do it like this...
555-five-five-six-8888
Same thing with an email address...
example AT yahoo.com
If you're meeting someone to make a deal, make sure it's in a public place. Most people aren't comfortable with you coming to their house, so you can suggest a nearby gas station, grocery store, etc.
Any time you're buying/selling something that has an on/off switch (tv, polisher, car amplifier, etc) be sure to show the other person that it works.