Just found out yesterday that one of my old Commodore 64 games had been cracked by a German cracking outfit (the Laxity group). I don't mind all the level packing, documentation and NTSC fixing, but what was cheeky was the scrolling text saying that as many bugs have been fixed, the game is now playable...
The only bug I knew of (and was most likely caused by using the program in an emulator - it only happened once - was the "continue the game" timer)...