If you came here looking for the cheat codes for Minesweeper, you're not going to find them. I think that in a game like this, where you're not really competing against anyone except yourself, there is no point to cheating. Besides, if you get a really good time, people will say "so what? he cheated.".
I think that if you are going to cheat, it should only be if you are in contention to beat your all time high score by a significant amount, and you are stuck with one of those damn 4-squares/2-bombs traps. Of course, I'd much rather you just guess, and start over again... Eventually, you'll get it. =)
So if you really want to cheat, look somewhere else.