Playing around with GuruNet's "answers.com" service earlier today reminded me of past positive experiences with similar internet bootstraps (Yahoo!, Altavista, Google et al).
I have always believed that self-annotation will ultimately drive the realization of the semantic web vision. GuruNet is an interesting effort that should lead down this path.
Here is GuruNet's answer to the question: What Is SQL?
The Web Services, XML, and RDF angles should be pretty obvious (I hope!).
BTW - GuruNet does have a sync latency issue re. Wikipedia that it will need to address sooner rather than later.