I ran across the Birdfreak blog a few days ago (they’re located in a town not too far from where I grew up). They’d like to compile a list of a million birders in the US. Here is what they say:

The One Million Birders Project is a lofty goal to get a list of names of 1,000,000 birders. This list is not to create a mailing list; it is just a way to quantify the number of birders there are in the U.S. It is the hopes that together, one million birders can create a big difference in conservation and habitat restoration efforts.

You can sign up on their website: http://birdfreak.com/million/