I use paypal. It`s a good service. A few times I`ve had customers who have had trouble with it, but then you can walk it through for them, or you can do it for them (if you`re not dealing it tons of volume sales -- we do contract service, so we don`t get more than 8 sales a month). I`ve enjoyed paypal because of their options. Someone makes a payment and it goes into our bank account. The auto-rebilling features are also very easy to use.
A spin-off from my company, now undergoing funding. A real-time, live-event polling program. Engage your audience at your next conference, seminar, talk or retreat!