I was snowshoeing over at Thomas Park yesterday and saw a few guys going down the hill with ski bikes. Flying down the hill looked like fun, but walking back up didn't.
Just saw this story today.
http://www.bikeradar.com/news/article/n ... pes-36535/
"Originally conceived as an aid for Bach as a way to push through snowpack and have his bike glide better on all-day adventure rides, Bike Boards are essentially repurposed snowblades that attach to virtually any mountain bike tire..."