In the area of security, I have been using
PhantomFrog. This is some very nice software that will pay for itself quickly. One of the things that is the bane of a program owners existance are password trading sites. He has incorporated Geo-IP into the process to minimize false positives on password traders and provides for Members to reset their own passwords. There are also versions that limit bandwidth and thwart brute force attacks. It integrates with CCBill nicely and is cheap and worth checking out.