Our pal Fra Fondi of HobbyMedia writes:
Joker Racer R/C Server is a small-sized and power-efficient Llinux server designed for radio control cars. You can drive your R/C cars over the internet with your browser (or with a custom iPhone application) by connecting the store-sold web camera and the standard servo/speed controllers of your R/C car.
No word (that I could find) about the cost. [Thanks, Fra!]