Anton over at MO regularly releases database dumps, which are great if you want to search through everything (including comments), or go statistic-hunting (e.g. compare the frequencies of certain words to gauge interests). Is there a way we could get something like that here?
I assume public dumps will be made regularly available once Math.SE leaves beta. Once Math.SE (and perhaps MO) become full SE 2.0 sites, you can explore their databases using the awesome SE data explorer. For example, you can see that about a third of my answers on SO have been accepted
You will see database dumps for Mathematics.SE starting with the November 2010 SE database dump, which will probably be released within the next few days. The reason they have not been available yet is that Mathematics.SE did not exit beta before the October 2010 database dump, which is a requirement to be included.
To expand on Anton's answer:
Jeff Atwood commented on the StackOverflow blog
We generally wait 4-6 months until a site has enough data to be useful.
referring to the cc data dumps that already exist for StackOverflow/ServerFault/SuperUser.
As I understand it, the Data Explorer tool Anton mentioned is based on these database dumps. It doesn't pull anything from the live StackOverflow database.
See this question on meta.so.