Cleared PMP on 28 th May 2011.I would say start with Head First ,then PMBOK and then Rita.You HAVE to understand the stuff/concepts to get thro this exam. I would say @ least 3 months of dedicated time is needed for this exam. Study PMBOK end to end this is a must...no matter what else u read Rita,Andy Krowe,etc. etc.

Head First PMP helped me understand the concepts really easy and last but not the least " The Rajesh nair" notes....man what a piece of outsanding effort...hats off to u Sir.