I'd love to know what lanuage you used as i'd like to get back into coding just for myself or at the moment at least since i did learn some simple Visual Basic in college but i've not really kept it up and probably know nothing now. May install VB and do some messing about with it and find some tutorials.
I started with C++ until pointers confused the hell out of me, then I switched to Objective-C to match up with the iPhone SDK. Now I want to get into Open GL programming, see if I can pull off some fancy effects.
Ahh C++, i think i'm installing that along with VB and whatever else as i got visual studio 2003 and installing everything from that so may see what suits me better. I do find it great that your app is doing good as you've learnt coding from nothing and created a simple but fun application and released it on the iphone for eberyone to download.