I think writter's block comes from plateauing at what you already know. Do what dinell said, broaden your horizons. News ideas will open you up alot, and don't be too critical on what you are doing. This goes back to plateauing, you've gotten tired of what you can do. Learn something new.

Don't throw out ideas either, ideas are ideas. Sometimes getting through the front door to a good song starts with an idea.