Authorize.net PHP component
Ben has released his Authorize.net PHP component. Looks like a great piece of code, I wish I had this when I was doing the UserScape store. Heck, I spend nearly half a day just trying the find documentation for the old junky one Authorize gives you(if you can find it on their site). Ben has also done a nifty job customizing his HelpSpot installation and the knowledge books for his documentation.