It is my understanding that DE, Diatomaceous earth, works well at killing Bed Bugs as well as other insects. It's perfectly safe to humans and animals as many organic growers use it to protect their crops against bugs.
I used it a few years back when I got ate up by chiggers. Covered my hotel bed and rental vehicle with it and after a bleach bath of my own I didnt have any more problems. (i got the chiggers in the field not in the hotel, but I was nice enough to bring em back with me)
http://en.wikipedia.org/wiki/Diatomaceous_earth#Pest_control
