The Quirky community has created the Cradle, a portable, lightweight laptop desk for iPad. It features a minimalist bent design constructed from Plyboo (bamboo plywood, a sustainable alternative to wood) and an integrated circular plate, made from matte, soft-touch plastic, that allows you to rotate your iPad between portrait and landscape views.
The Cradle also comes with a foam cushion with woven covering built into the underside of the desk, which rests on your lap for added comfort. The price is $52.