If you're looking for the most lightweight, yet protective smartphone/tablet cases, we highly recommendcarbon fiber as the material of choice. It's also one of the cooler looking materials, giving your mobile device a F1-techy finish...
Ion Carbon Cover for iPad 2
The Ion Carbon Cover protects the entire aluminum back of the iPad 2 with an excellent magnet enclosure system to keep it all closed up while on-the-go. As with Apple's own smart cover, when you close the Ion Carbon, the iPad automatically goes to sleep and you can roll it up to fold a stand.
monCarbone Hovercoat iPhone 4 Case
The monCarbone case is a handcrafted carbon fiber case that's perfect if you are bored of your cheap plastic case and want something with a more polished, sophisticated finish. The case weighs almost next to nothing and provides interference free design.
Ion Predator Zero Carbon Fiber iPhone 4 Case
The Predator Zero cases have built-in Iridium chassis for extra support while avoiding signal interference. The Predator is the snap-to-fit hard grip cover kind and it's compatible with the iPhone 4 regardless of the carrier, safe for both Verizon and AT&T subscribers.
monCarbone iPad Case
The iPad case from monCarbone, snaps into place with a solid "click" and stays there without damaging the aluminum back. It's super thin and featherlight, and notably you can still access all the controls and can use all the ports while it's on.
For the DIY hackers out there, here's an $8 alternative to real carbon fiber. You can create this amazing looking cover for your Evo 4G using self adhesive carbon film. Pretty cool!