OK, I know this doesn’t really sound like something you’ll need in the field. Well, it isn’t. Unless of course you’re in the field in between looking at houses, which I am these days. So what does this little bugger do? Well, it can figure up payment, interest, amortization, track progress of mortgages, car loans, credit cards, etc.
http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=286069264&mt=8