So we have a new big laptop (they've become both big and cheap these days), and my worry is that the blanket could obstruct the laptop vents and lead it to overheat.
We also have a very nice and stylish looking tray, made of plywood and melamine. The designer thought it would look cool with only two raised edges (and I found it too). But the surface is very smooth and thus slippery. As a result, things slide too easily, and the tray is quite unusable, as such. (To find similar trays, see www.esprit.co.uk/, or www.cb2.com/family.aspx)
Fortunately, these two problems happened to nicely merge into a one solution.