There seems to be questions often asking about how to sell photos, or how much, exhibits, etc. My brother sent a copy of the 2005 photographer's Market to me, and I got it today (why? i don't know, i told him i wasn't ready, and it costs $25).
Anyway, It is very easy to navigate, and has tons of info on submissions for all styles/subjects. The book lists 2,000 companies/galleries and what they are looking for, you can use the index by category (wildlife, journalism, etc.). IMO, after scanning through, it can be helpful to newbies (yours truly!) as well.