i believe the average rate among graphic designers is something like 15-35 dollars an hour. however, with websites, you're better off on a per project basis. i'd recommend doing it as custom consulting, discussing pricing on a per project basis. if someone needs a few graphics and a paragraph or two, it should cost to much, if they need/want a graphics intensive site with rollovers and fancy pants stuff like that, it should obviously cost more. i've seen around 50 bucks for a simple few page site, to thousands for databases with all sorts of hoohaw and doodads and such. basically experiment with your first few clients. find out what there budget is, and then offer them what you are willing to do for that price. and always remember. if something takes the average person 1 hour, but it takes you 45 minutes, you still charge liked it took an hour
-Brian