time for the most oftenly blocking poet to join this thread
i've had my fair share of writer's blocks (even more than my share, anyway), and it seems to me it's not in what you do, how you think or what someone tips/tells you, but in the inspiration itself that puts you in or out of a writer's block - i mean i hadn't written anything for 4 months or so, i could easily put the blame on my university exams and lack of time and so on, but it is just the fact that nothing meaningful actually happened to me in those 4 months, lost in studying there was no inspiration. so tips, as useful as they may be when you have the general idea, the outline, the rhymes etc. do not always work.
otherwise - music, playing with words in your head, jotting down rhymes on the last pages of notebooks, a book book(i call it a life book) are all pretty good ideas to help you out WHEN you want to write, you have an inspiration but no idea how to turn it into a meaningful work of written art
(damn, i need to write something already!!!)