well... on a carputer, IMO, the keyboard is a supplemental device. This said, when I need it, I don't want to type emails, but to enter OS commands and the like. I don't want to have to hold my arm to the screen (not confortable) but I don't want either to have to carry a huge keyboard (standard keyboard is huge for a car environment).
Therefore a compact keyboard is something I imagine being good to put in the glovebox.
the lappy-sized keyboard is too big for the glovebox. Smaller ones might be mounted somewhere around the driver's seat and be used to control some part of the car environment.
I'm still looking for my perfect keyboard. I want something small, wireless, and have a trackball (preferred, or other pointing device).
trust me, no trackball in the car... every bump on interstate will set it off, so if you have a set of on screen controls in your DVD screen, etc.. then it will be popup, fade away, popup, fade away...
I learned this the hard way (1200 mile trip, no other form of control....)
EPIA SP13000, 512 DDR400, Seagate 300GB, Belkin PCI 802.11g w/external antenna, Holux GM-210 GPS, XM Direct w/ serial, Dlink FM, Opus 120 p\s, Rockford P4004 amp, Xenarc 7" VGA touchscreen custom mounted in double din spot -- see pics and write up here!!