I SHOT IT is a website that allows photographers to submit their photos in various competitions for a small fee. Entries are judged by a panel of well-known photographers and the winner recieves a cash prize and an $800 Leica V-Lux 40, the greater the number of entries, the greater the prize money. The most recent Dog Photo competition that ended yesterday closed with almost 1,000 entries and $1,200 in prize money.
One of the current running competitions is Sports so all you fly fish photogs could get in on the action.
There are also a number of other categories that would be applicable to the world of fly fishing photography.