Interesting thread. Some sort of tiller-lock is indispensable for single-handing.
I must say that I really like our Tiller-Tamer ... especially after replacing the crappy supplied line with a decent piece of proper cored
boat line (1/4" or 5/16"... can't remember). The original line was too soft and made this horrid high-pitched rubbing/squeaking sound whenever you moved the tiller. I like the fact that you can adjust it from frictionless, to a bit of drag, to nearly full lock.
I mounted ours on the underside of the tiller, which keeps it from the sun and it's less likely to snag other lines.
The rack and comb ideas are pretty interesting too.