I started developing GraphPad about 2 years ago and it's been an incredible learning experience. Objective C, XCode, Apple's technology and drawing applications in general were all new to me then, and while even now I'm by no means an expert, I've come a long ways from the beginning. Along the way I've gotten a tremendous amount of help from other developers, and customers alike, and it's safe to say that GraphPad wouldn't be nearly the product it is without other folks support. Unfortunately, GraphPad doesn't quite pay all the bills, so while I'd love to continue working on this full time, I'm afraid I have to focus on getting another job or long term contract. As a result, progress of GraphPad will almost certainly slow down.
Feel free to contact me if you come across and bugs or have enhancement requests. I'll respond as quickly as I can.