Brainstorming works wonderfully for me. As a matter of fact, I'm part of a Yahoo group where we post chapters of stories we're writing when we need a little help. Everyone reads and then just throws out ideas. Usually something will get things clicking. It's the group dynamics and taking off the filters that works so well.
Sometimes it's not writers block, but rather an emotional block because of some curve that life has thrown you way. You may just need to step away for a while. And hopefully when you return, you'll use the lessons you learned to further your writing.
Good luck.
