On sale at Target for $19.99 ($5 off) was just what I was looking for for my work on the porch. The "sidecar" slides into the side (and is adjustable for size) when not in use. It is shown here with a mouse, but I can put a small notebook and pen on it to take notes.
The lapdesk is so I won't burn my legs when using my netbook or laptop. Both get hot when used for a long time. Yes, I have a plug on the porch.
The underurface had rubbery treads so it won't slide off my lap and the upper surface is washable. Wow, do I need that! It will fit in my laptop bag! I tried it with my iPad and the Padprop I use daily and because it is non-skid, that works well too!