I must say, the Mac OSX Aim Calculator is an awesome little tool. I was using that on my POS iMac until I finished programming the basics of my trading program. I actually brought my Mac up from the garage to specifically use the Aim Calc on the Mac.
It's extremely well done and very helpful, I highly recommend it if you have a Mac.
My complaint with most of the other programs is they have way too much 'bells and whistles' which is completely, in my opinion, against the entire idea of AIM which is to keep things simple. :)
I wrote my program in Director MX and it took me like 2 days to get it working and saving all the data and downloading the current stock prices from the net and storing all of your trades and giving advice and all of that. It's really just tedious to program, not difficult. :)