So I stumbled upon this while surfing the web. I don't know if it's any good (or if there is better out there) but I just wanted to get your opion on it. I know a swiss army knife or multi-tool would be pretty much the same, if not better, but I was thinking of putting this on a key ring. Also there were a few other models but this was my favorite.
Here it is: http://pockettoolx.com/products/piranha
Here it is: http://pockettoolx.com/products/piranha