Woot Woot Cash is a great program. It is handled through CCBill so you can ensure honesty and HeyMatty will hook you up with everything you need.
Solar Cash is also handled through CCBill. This has one the the best webmaster features I have seen: a gallery generator. It has nearly all the members area content so you can guarentee having a diff gallery to other people and allows you to completely make the gallery online and easily download a zip of it.
