For those who are backpacking in trail runners, do you use gaiters and if so what type?
yes - I use NB 805's with OR rocky mtn low gaiters
From a chapter on Gaiters from a book called Fixing Your Feet :
MiniGators (http://www.minigators.com)
RaceReady (http://www.raceready.com)
Western States (http://www.ws100.com) Click on the "store" in the left column
Book (http://www.footworkpub.com)