Great advice given so far here, Craigster, and welcome aboard. I've bought and sold a couple guitars both here and through eBay, and no matter where you buy, communication is the key. Nothing feels creepier than sending a couple $Ks into the ether if you don't know and trust the seller.
I might add that while our forum is a great place to find a good used guitar, and the one I certainly prefer, anyone can join it, so the usual cautions pertain.
Remember, no question for the seller is a dumb question. If he/she won't or can't answer, RUN! And of course, no matter where you buy, if it sounds too good to be true, it probably is. [E.g.: The mint HD-28 for $900 that recently slid through this market place and the UMGF, and the el cheapo "Taylor" 914 knockoff currently on eBay @
http://cgi.ebay.com/ws/eBayISAPI.dll...7102866&rd=1.]
The bottom line before the bottom line is GOOD COMMUNICATION.
Happy hunting!