[idm]

Absolutely. This is an active project and I have a plugin system for synthesizing additional data sources. In the research literature, I have seen several impressive US census-derived synthetic population projects, so finer-grained data are a future direction.

[pdabbadabba]

Great! I've seen the U.S. Census Bureau's American Communities Survey, which has extremely fine grained data, but with a few gaps for, e.g., religion, Internet access, etc. Do you know of anything else as granular as ACS?

This, again, is really really interesting. When it comes to the fine-grained U.S. data, we may be approaching if-you-dont-build-it-I-will territory. :)