Some resources for getting the PMP certification (based on a Linkedin Question)- This is a useful not too expensive and not very very tough certification for professionals who manage projects (and don’t we all !)
Online Websites-
Providers- http://tel.occe.ou.edu/cgi-bin/PMI_Provider/repsearch.cgi
The main website –http://www.pmi.org/Pages/default.aspx
Credentials-http://www.pmi.org/CareerDevelopment/Pages/Obtaining-Credential.aspx
Some white papers –http://www.globalknowledge.com/training/whitepaperlist.asp?pageid=502&wpcat=7&sort=&country=United+States
An additional book-http://www.amazon.com/PMP-Exam-Prep-Fifth-Passing/dp/1932735003
The main book – PMBOK

The detailed answers on the Linkedin site are much more helpful- Try it.
http://www.linkedin.com/answers/management/business-analytics/MGM_ANA/207457-6691344