Vinyl three-ring binder - tilts up the back when on the desk, the front when on the lap - air gap and cardboard inside heat sinks the laptop to reduce fan use. Vinyl grips the rubber feet. Use a little metal office clip to channel the power cord.
I use a lap-tray made by a company called 'Castle Melamine' It's basically a picture (of a pussycat ) with a bean-bag fixed to the back. The soft back lets you adjust it to best angle even with your feet up, and there's room on the tray for a USB mouse as well. Cost me a pound from a car-boot sale.
I believe it was from Staples, but it might have been Office Max. A friend that I introduced to netbooks bought a bamboo cutting board. Looks like this one:
for years for my laptop and like so I purchased the ILAP 12 (a smaller one) for my NetBook and like it for the NetBook just as much as my Laptop one. Best price I could find one for is on this website