PDN has a list of several photo competitions with upcoming deadlines. Check ’em out. Also check out the American Photographer/American Illustrator ones too. And the Communication Arts competitions aren’t that far off either; Photo in March, Interactive in January, Illustration in March.
People often ask whether it’s worth submitting to these competitions and I have to say my answer is yes…and no. After having been a judge, I can tell you that getting in (winning) is essentially a crap-shoot–it’s all depends on what those particular judges like/dislike at that time. But, if you do get in, it can be the thing that really gets your business moving. In other words, it’s a gamble and everyone has her/his own tolerance for that kind of risk/reward equation.
I think if you can afford to “lose” the entrance fees, you should be entering.
Best of luck!