1. Read PMBOK
2. Read 'How to pass PMP on your first try - Andy Crowe' (Easy to read and grasp)
3. Read Delegation chapter by Vijay Verma from the PMI site (eReads and Reference)
4. Read 'PMP Exam Prep' - Rita Mulcahy
5. Read 'Project management professional' - study guide by Kim Heldman, PMP
6. Read 'The project management Question and answer book' by Michael W.Newell, PMP and Marina N. Grashina, PMP
7. Read 'PMP Exam Prep 2005 Fifth edition- Rita flash cards' (also known as hot topics, for quick review, to remember key things)
8. Rita PMP slides
9. Go through lots of practice exam from Pmstudy, Oliver's test questions, Head first sample 200 questions, Pmzilla questions.
ref:
pmi site - http://www.pmi.org/Pages/default.aspx
pmp bank - http://pmpbank.googlepages.
pmp tips - http://pmtips.net/