Thanks for the welcomes (and the warnings). I did spot a few murky looking byways; I've stuck to the well beaten tracks so far.
I hope to live up to my "worthwhile posts" ambition, but, well, "worthwhile" is a terribly subjective concept, don't you think
As for time wasting, I have a unshakable rule: 500 words on the WIP buys me an hour of browsing. Otherwise, I'll never be finished...