After reading Dave's comment of having about 2,500 strips available for free on archive, I got curious and checked, and February 27th, 2009 marks the 2,500th strip of SHELDON!!!
(...not including strips from "A Well Balanced Meal"...)

KEEP ON BRINGING THE AWESOMENESS, DAVE!!

~from a Sheldonista with WWAAAAAAAAYYYY too much free time. (But who obviously spends it well.)