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not at all -- we're aggressively adding datasets, and those are among the ones that are on the top of our list :-)

I really like it.

Are you allowing API users to cache/store data?

Glad you find it useful! Yes, you can write data to the API via custom views. See Demo 1 at http://code.google.com/p/geo-api/wiki/Demos for an example of writing check-in comments to locations. Full user view API docs here: http://code.google.com/p/geo-api/wiki/ViewUser

Groovy, good luck with that!