"Sesmark" puts out a cracker called Rice Thins that is rice-based and both dairy and wheat-free. They are very tasty (I've tried Teriyaki and Sesame), light on weight, and have a great crunch, much like a chip.
You can eat these rice thins without much guilt. 15 crackers gives you 130 calories, 2.5 grams of fat and 0 sugar. I've seen these EVERYWHERE: Rainbow Foods, Lunds, Whole Foods, Wedge Coop, etc. Now you can relax, knowing your guacamole, hummus or soup will have a friend again :)