The NR90GC gas-powered framing nailer is a cordless alternative to pneumatic versions, the manufacturer says. Using an interchangeable 7.2-volt nickel-cadmium battery and fuel rod, the tool drives up to two nails per second and over 4,000 nails per charge. Moreover, it weighs only 7.7 pounds, fires clipped-head nails up to 3 ½ inches long, and has a lockout feature to prevent accidental firing. Cost: $417. Hitachi Power Tools. 800-829-4752.