Gamedesigning.org A fantastic site with tons of information about all aspects of game design careers.
Gamedevmap.com "gamedevmap is a living map and catalog of game development organizations."
Gracklehq.com "A job site for the game industry."
Jobs.gamedeveloper.com You can browse jobs by keyword and location.
Tom Sloper--A long-time game designer and teacher, Tom Sloper, answers questions about game design in clear no-nonsense language. There are many helpful nuggets of career advice.
Workwithindies.com "Finally, a single place to find all the cool jobs in indie games"