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...
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.