How many Blu-ray movie titles are available/been released?

The number of Blu-ray movie titles currently available on store shelves is approximately 6,000. This is a small fraction of the number of titles available on DVD, but is quickly growing and now includes many old movies. As studios are able to charge a premium for Blu-ray movies, and also like the idea of being able to re-release old movies on Blu-ray, the number of titles is assured to continue growing.

How many Blu-ray titles have been released?!