I have two books that someone preparing for the PMP exam may find useful, particularly someone studying independently. I took the exam late last year, so the materials are current. If interested, contact me at bberthot@berthot.com.
1) Heldman, K., & Mangano, V. (2009). PMP® Project Management Professional Exam Review Guide. Indianapolis, IN: Wiley Publishing.
*** Based on PMBOK 4, a good review book which includes a CD with 2 practice exams, flashcards, etc.
2) Sanghera, P. (2006). PMP® In Depth: Project Management Professional Study Guide for PMP® and CAPM® Exams. Boston: Thomson Course Technology.
*** Based on PMBOK 3, I found that virtually all the practice questions were still quite useful!