Craigslist, the free online classified site seems to be finally catching on here in Knoxville. If you have anything to sell or are looking to pick something up on the cheap, this is the place to do it. Lifehacker, just published this informative guide to selling on Craigslist. This compliments their earlier Power users guide to buying on Craigslist.
As with most everything on the web, it is buyer beware on Craigslist. There are tons of scams out there hidden among the good deals. Of course the best rule of thumb here is: If it sounds too good to be true, it probably is.