[mltsy]

I would at least give them an honest, non-emotional resignation letter, so they know what the cause is, and whatever notice you want to make it. Considering they're not paying you, 2 weeks is probably not fair, but at least a day or two, whatever you think is fair. And then leave.

This may be beyond the scope of "business," but I agree with the don't burn bridges comments. It is your responsibility to get yourself out of a bad situation as soon as you can, but as long as you have the power to do it gracefully, and with respect, that's the right thing to do - or rather, it will bring you good karma ;)