Small and medium binder clips. Great for, well, clipping stuff.
I also carry a medium-weight carabiner with a four-foot loop of paracord on it. This rides on my pack shoulder strap. First thing into camp, the cord wraps around a tree and the biner goes through the end of the loop. Off comes the pack and it hooks onto the carabiner. Instant cupboard.
I like to download odd bits of reading material onto my Palm before heading out, just in case a rainy day needs something to pass the time.
There's a bandanna available through BSA shops that has some forty-odd knots on it. That and a few bits of paracord will keep me occupied for hours.
Bear