You've gotten a lot of great answers. I'd like to add one more. With over 20 years of experience moving people out of "stuck", there is one consistent aspect across the board....

After you've explored all the hard facts, external concerns, methodology, etc...you are still left with yourself. Just this week I began working with an entrepreneurial client I have known for 8 years. He has been "stuck" in one form or another for 8 years. He has never been my client before, but a friend. I've watched him grow immensely in his skills as a marketer to the point that he can run circles around most - in skills and understanding.

What he hasn't done up until now is commit to looking deeply at himself. You see, in the end 90% or more of success is an inside game. It's the stories you tell yourself, the perceptions you believe, the mission you have clarified and committed to. You don't see Brian Tracy or Tony Robbins preaching about revenue charts, or management teams or marketing methods. They teach the "inner game" of success because it is the only real game there is to play.

If your "stuck" is a moment in a day, or a specific task or skill that is requiring your attention, go forth with all the wonderful suggestions in this thread. But if you've been feeling that angst, that frustration, that "running around in circles" kind of feeling for awhile - it's time to look at you. My clients have called said that working with me is like seeing themselves in a mirror, only their reflection is really really clear. The call me the Question Master for nothing!

Best of luck to you!