OurPlat.com allows you to buy and sell runescape gold for bitcoins.

I'm in process of selling off my video cards, and grabbing a few block errupters.  Power cost is killing me on the video cards, least with the usb sticks, my power bill wont be through the roof and I'll still have some bitcoins to mess with.

Smarter idea would be to just buy bitcoins and sit on them with the money you would pay for a rig though.