I shoot Kodak Tri-X 400, mostly for street photography. I like tri-x because it is very versatile film, you almost have to intentionally mess up the exposure for something to go wrong. You can also push it to 1600 very nicely, 3200 is alright but lots of grain.
The latitude of the film is important to me because my camera, a Yashica 635 TLR, doesn't have a light meter and I don't really want to carry one around so I just base my exposure off sunny 16 and very rarely have a exposure problem.
Tri-X also scans very well, which is important for me because I don't have an enlarger and scan all my film.
Canon 400D & 40D - Sigma 10-20 F4-5.6 - Canon 17-55mm F2.8 IS - Canon 28-105mm F3.5-4.5 - Sigma 70-200mm F2.8 - Canon 50mm F1.8 - Canon 100mm F2.0 - Canon 400mm F5.6http://www.flickr.com/photos/marcarnault/