I'd say Jason Marovich has an excellent method. I've never been stuck with writer's block, but I imagine it comes on when one is under some sort of pressure or obligation to write on a specific topic or by a certain deadline. Jason's idea of writing down anything which comes into you head sounds like a good idea to me.
For many years I've been into an area of writing which is regarded as para-normal: Automatic Typing. You can introduce yourself to this by writing a question with your dominant hand - with most of us the right - and letting your left hand come up with the answer. This means a pen in both hands and a really open mind that it will work. It will. However, patience is required, and persistence. Don't take it too seriously and just hang in there. Once the answers start coming you'll have discovered a whole well of creativity within you never realized you had.