Superknife/$15
The UltraShear is an anvil-style cutter, rather like a set of pruning shears. But unlike standard pruning shears, you can replace the UltraShear's razor-style blade when it dulls. A push-button safety locks the blade against the anvil for storage. The shears weigh in at 7-1/2 ounces, and their contoured rubber handle looks quite comfy.
Bosch/$100 for a set
Bosch's quick-change hole saw system makes it simple to snap a new saw cup to whatever pilot bit you have loaded into the adapter—so you’re ready to make holes in no time flat. Of course, you could always carry around a bunch of hole saws with the pilot bits already in them and re-chuck them when you want a different size. But Bosch’s solution seems slightly more elegant.