Years ago, I often gave a lecture to S.E.A. students and other groups that was intended to provide an understanding of basic stability concepts with a minimum of math. It was quite popular at the time so I recently put together a web version of it. It's still a first draft and I haven't yet linked it from my web site since I plan to work on it some more, probably next winter at this point. I've provided the link to a couple of forums and groups though as the feedback and comment I've gotten have led to some useful clarifications and improvements.
I still can't post links so put the standard http thingy with the colon, two slashes, and three w's in front of rogerlongboats.com and then "/Stability.htm".