Get your pencils ready! It's the Great Backyard Bird Count.
I will be participating, but seeing as how I'm having a party Saturday night and the house is a mess, I may not be participating Saturday, so Sunday and Monday it is.
By the looks of things, it seems like this should be pretty easy - they even provide PDFs of the types of birds you're likely to see, printable instructions and the data form you need to fill out.
But you'd better believe that I'll be filling my feeders to make sure I get the most birds possible (which means I should probably try to stop by the store and pick up more suet).