Slate — Mobile AirDesk
The Slate Mobile AirDesk is a Kickstarter project for a small, portable "desk" that sits on your lap. Cut from a block of premium bamboo and large enough to fit 13"-17" laptops, the Slate sports several rows of ventilation holes in the section where your laptop sits and the bamboo absorbs any remaining heat, so your legs stay cool during use.
The Slate also has a built-in, heavy-duty mousepad, along with a docking station for an iPhone or iPad mini (but not the iPad Air, because the slot isn't quite large enough). For people who do a lot of work on-the-go, especially those who need multiple devices within reach, the Slate Mobile AirDesk is worth a look.