I've got a gorillapod which works well if there is something of suitable height to use. I also asked Mrs Norm to make me some bean bags in various (small) sizes, which are also great when there's something at a handy height. You can always get the support you need under the body and lens with a decent bean bag. I usually have a couple in the car, they are superb at placing on car bodywork which is never at just the right angle.
I've got a fecking great Benbo which is unrivalled as long as you don't need to carry it anywhere. It's great for getting the camera into strange angles and positions, macro photography setting it up a few inches above the ground or a few cms above a table. Strangely, though, I can never get the Benbo exactly where I want it in a studio, so I've got a Manfrotto too.
I've got some cheap-ish tripods which work ok in the field if you can hang something fairly heavy under the middle of them - it's a good place to store your camera bag when you are working. You can make even flimsy tripods fairly solid by doing that.
When I'm out'n'about, though, I use monopods. My favourite is an old CamCane, although I haven't seen them for sale for a little while.
