When people consider project management certifications, they generally think of the PMP. This is easy to understand, given that it is, by far, the most popular (and oldest) PMI credential, with over 380,000 active PMPs as of May 2010.
However, the PMP isn't necessarily the only option and sometimes may not be the best option. The CAPM (Certified Associate of Project Management), introduced in 2003, may be more appropriate for some candidates.
The CAPM has been slowly gaining recognition over the past seven years and can now be seen referenced in many job postings, etc, and there are now over 11,000 CAPMs worldwide.
Here is a comparison of the two credentials: