Railz: Convert Skateboard to Skiboard  It won't be long before
the snow starts falling, and then it'll be time to convert that
skateboard to a slope-gobbling four-runner skate ski-board. Do
it with Railz, four metal-edged skis that replace the wheels on
your favorite skateboard, converting it for downhill skiing in a
snap. The conversion kit is $50.  Product Page [Flowlab, via Sci
Fi Tech]