I joined my first W3C working group, the DAWG, about 16 months ago. Since then, I've had the opportunity to see all sorts of questions about SPARQL in all sorts of places: I've fielded questions from many IBMers whom I represent on the working group; I've seen question after question posed on the public DAWG comments mailing list; I've answered SPARQL questions posed on #swig; I've read blog posts and comments about SPARQL; and in recent months I've followed the action on the nascent public-sparql-dev mailing list.
As SPARQL has started to receive more attention and slowly build momentum before and during these 16 months, the questions I've seen (both technical and more general) have become more and more familiar and more and more frequent. With this in mind, I set out a couple of weeks ago to assemble a SPARQL FAQ. It's still a work in progress (in fact I have a new batch of questions that I'm already working on writing up), but the first version is ready for your viewing, learning, and referencing pleasure. Enjoy the SPARQL FAQ, and please let me know if you have any feedback, suggestions for new questions, or suggestions for answers.