This Skaterack could be a lifesaver, if you think about it -- how safe can it be holding onto your skateboard while cycling, or having it on your lap or poking from a backpack?
While the price hasn't been confirmed for the Fairdale Pannier Skaterack, it looks like the safest option for dual modes of transportation. It attaches to the bike's rear axle with a cord and a loop, and is designed to be lightweight so it doesn't cramp your style. The only problem I foresee with it is that someone might steal it when you're off circling the half-pipes, but the same can be said about your bike, too. [Fairdale via Prolly via WIRED]