I'll third the Shelf-It, and I really like the Stanadyne bottle holder. I'll be doing that one.
As for the Shelf-It, does anyone know how to mount the visors so that they aren't at a crazy angle if you pull them 90* to the side?
Here's my doodad (not the best, but it's a doodad): For the short-cab trucks, mine came with a vinyl thing that hangs from the trim screws right below the back window. It has a bunch of pockets, great for all sorts of junk. I'm not sure where it came from, but I'd venture a guess that JC Whitney might have one.