Getting familiar with maps is an important part of most RTS/FPS games. In most games, certain maps are more popular than others, and I assume that's also true for SC2.
I'd like to know which maps are played most often so I can focus on learning those as I start with multiplayer. I saw a related question from BlueRaja, but it was about training maps. Clearly I'll form my own opinion over time, but I like to study things as part of learning a game.
Is there a site or service that monitors gameplay and will give me an easy, factual answer--if not for all StarCraft 2 matches then for a good number of matches?
If there isn't, can anyone think of another way to find out? I'd be happy for a consensus from experienced players, though maybe that drifts too far into the subjective.
In case the answer varies by country and play level, ideally I'd like to know for US maches and low-level players.