CHEAP ROUTE
Take a car mount like this (http://www.nyko.com/nyko/products/?i=46) , paint it to match the dash, and attatch it via included adhesive.

EXPENSIVE ROUTE
If you want to put some work into it, do some research into fiberglass molding.
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop