Using the developer edition of Delphi, in a couple of weeks, I wrote a simple accounting package, with foreign currency support, for our Mom and Pop computer parts shop.
Coming from a Forth and assembly background, I was rather impressed with it.
Unfortunately it only worked on Win95 and not Windows 98. So that is the only project I used it for. Well I bought it only for a couple of hundred guilders at a computershow, instead of the +2000 guilders originally price.