This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
I see interview questions falling into two categories... (1) the question is really technical and subtle, and should be handled in the appropriate forum, or (2) the question went bad for the interviewee, and he/she wants to know why, and this is probably best handled in the job discussion forum.
I don't see the value of having a separate interview question forum, because interview questions are intentionally "made up" (modified) during the interview, to see how the interviewee can handle questions just beyond his/her comfort zone. They also tend to be open ended, so there is no single right answer.