The votes are in! This is the winner :-) Thanks for your help choosing a photo!
1. Black & White Architecture (revisited) - A building or, better yet, some interesting detail on a building. And make it black & white (no sepia, no tinting, just black, white and shades of gray). Be sure to check out the Week 3 Tidbits thread for information on b/w conversion -- DON'T just convert to gray scale!
Info: This was taken at the Disney Concert Hall in Downtown LA. I love the Escher feel to these staircases. To get the black and white perfect I always mess with the curves first. I pull up near the top and pull down near the bottom to increase the contrast. Then I used Dave's "Channel Mixer" method to put it in monochrome with 70:20:10 R:G:B.