According to a New York Times article, there are one millions app out there now! Just to give you an idea of how the app count has been mounting, here are some numbers:
1.8000 apps – Oct 2008 (all for apple products)
2.100,000 apps – Dec 2009
3.500,000 apps – Jan 2011
4.750,000 apps – July 2011
10,00,000 apps – Dec 2011