Curbing the Munchies
Obviously the most obvious tip - don't have anything around to munch on - really doesn't work in most households. You don't want to deprive the rest of the family but then those things sound a Siren's call every time you get a little bored. So what might work (WFMW)?
If you have things around put them in a cupboard that you need a step stool to reach. Put healthy snacks on the same shelf. Put the step stool in the basement or garage so you have to hunt it up to use it. The delay and aggravation involved in getting to the munchables might help you skip it altogether.
Next, allow snacking if you brush your teeth before and after the snack. Again, the forced delay might give you second thoughts about eating. (This is also a tip to apply to bored kids that want treats too close to dinner.) It also eliminates munching in the car since you can't brush.