Kodak Kodak has a great Website. You can find info about everything they make.  Check out 'Taking great pictures' from their homepage.

Kodak's Professional Black and White Site  Lots of info here, also a great showcase for some of the B&W Masters.

WJ's Infrared Pages  This Website is astounding. You could spend months following links here. Everything you ever wanted to know about infrared and then some. Even if you don't shoot this particular film, surf this site. 

Monte Zucker  If you want to know anything about shooting weddings,  visit this site.  Monte Zucker is arguably the best known, and perhaps the best, wedding photographer in the country.  He has a great site full of tips and tricks.
Legend Dies. Monte Zucker: 1929-2007 Rest in Peace. Website still active.

Outdoor and Nature  If outdoor and nature photography is your 'bag'.  Try this site. It's by George Lepp, a pretty famous guy in this circle. Tips and tricks and product reviews

New York Institute of Photography  Very large site, lots of information about things photographic. Photo contests open to anyone (not just their students).

Minox film processing   This is the official US place to have your Minox film developed.  You can also buy fresh film from them-color or black & white.

www.lightimpressionsdirect.com  Archival matting, framing and presentation supplies.  Best selection to be found anywhere.