Each genre has its own set of notable games. So we don't list notable shooters when you are looking for notable gem matching games, what genre are you interested in?
I wasn't looking to focus in on any genre in particular. If I had to narrow it down, a list of the top 10 indie games would probably be a good place to start. Having never owned a an iPad, I am imagining that in the last few years there have been some games that shouldn't be missed.
Mostly, I was just looking for some ideas about games to try that are good examples of the versatility of the iPad for games. On the PC, I've been playing indie games, like Thomas Was Alone, Fez, FTL, Quantum Conundrum, Hotline Miami, and that sort of thing.