There is a slight self-interest here that I won't deny: often these contests require you to promote them for entry.
For now here are four contests I know are currently running.
The Great Rafflecopter : Win Books or Website Design!
July Giveaway : Win Deepening Fiction, a MFA textbook.
Kensington Brava : Get a Novella published!
Sweet prizes available this summer. So if querying is slow or writing is blocked, go take a look.
See you Sunday for Sunday Shorts, and keep your pants on.