You could easily modify one of those and turn it into a router table. Roll your window down and all the shavings would blow away - and your neighbors wouldn't complain about the noise. Need to round over a corner on a long board? No problem - just roll your windows down to the same height for a convenient stand! Coming soon - turn any car or truck into a wood lathe! Faceplate attaches to wheel so you can turn while you roll. :P
Maybe I'm admitting too much here, but I actually tried to order one. I have a 10.1" netbook with I use in the car a lot (never, ever while driving). As I get about 3 minutes in the office for every hour on the road, being productive in the car is very important.
All that said, the sellers on Amazon (it sells through 3rd parties) never fulfilled my order, so at least now I can't be blamed for the photos (at least not because of the netbook, we'll just forget I own a smartphone).