My weboost cell phone antenna and amplifier helps in fringe areas. Technomadia.com had great information on staying connected when you are traveling.
Not really a gadget, but I love the hanging shelves I installed in the bedroom closet. I found baskets that fit the shelves for small things like socks and underwear. If I army took them, I can fit ten tee shirts in a basket.
That last sentence should have read: If I army roll them, I can fit ten tee shirts in a basket.