OK, this is sort of cheating because I haven't done the projects yet, but I just discovered Quick Fists. They are rubber, mountable, adjustable grabbers. Off-roaders use them for attaching fire extinguishers, axes, flashlights, etc. to their jeeps.
I plan on ordering a whole mess of 'em and just going bonkers. My first task is my emergency tiller that is lying loose in my cavernous cockpit locker. I'm going to Quick Fist it to the bulkhead within grasp of the locker lid.
West Marine sells 'em, but they're cheaper on other sporting goods sites such as cabelas.com. Here's another site that has more pictures: QUICK FIST clamp in use