DeWalt's $33 manual Carbon Fiber Composite Staple Gun is made out of the stuff, and thus weighs 50% less. It's actually 2-in-1 tool as it can also fire brad nails.

As for design features, it's got a little windows on either side of the nose, so you can see when you're running low on staples/nails.

There's also a belt/pocket clip at the back, which can be placed on either side, to accommodate both lefties and righties. The tool is also bottom-loading, rather than slide-loaded (i.e. you pull the slide out, invert the tool, drop the staples straight into an opening in the bottom of the tool, then close the slide).

If you're in the market for a lighter-weight staple gun, in the video review below the guy runs it through its paces. He also beats the crap out of it to see how tough the housing really is (it comes with a lifetime warranty), dropping it off a ladder onto concrete, driving over it, leaving it outside overnight in freezing conditions, etc. The tool seems to hold up.

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