So most of the questions (of the 700 or so I've looked at) are about Darfur and NASA - many are repeats.
However, there are a number of questions that would be very good for Dr. Paul. I highly recommend going through and flagging those questions. Many are pretty evident and will sound familiar to those who have read his platform.
Topics include: Economy, dollar, 100 years in Iraq, the academic questions only he would understand, GAO head David Walker's comments, civil liberties, etc. Stuff which has both core Republican voter appeal but also sets him up well for the general election (since he won't change his views between them).