I've finished the shop interface (other than the actual buying stuff), and it's really awesome, in my [very humble] opinion. I've uploaded the code + exe, and you can get it from the link below my to-do list (which I've also updated). Please take a look, and let me know what you think!
Comments on code structure would be great, as long as they don't blatantly say "This is totally wrong, dump it and do this instead". [grin]
EDIT: I said 'jump' instead of 'dump'. [tears]