They come in two basic flavors: really wide short skis, such as the popular Kneissl Big Foots ($199 per pair, and easily recognizable due to the whimsical "toes" at the front), and devices that look a little more like traditional skis, such as K2's Fatty Ski Boards ($199) or Salomon's Snowblades ($299; www.salomonski.com).
And yeah, they're great fun. You can do all sorts of things that are possible but difficult on trad skisjumps, swooshing through powder glades, bumps, you name it. That's because they're much lighter than regular skis, and their short length makes them more maneuverable. More like having on big feet than skis.
The downside? Models such as the Snowblades track and glide reasonably well, but you're not going to get the big-slope smoothness and carving ability of a regular ski. So while you'll be able to cover some of the mountain currently off-limits to you, you'll also find that parts of the mountain you knew and loved just aren't as much fun. Life, as always, is full of compromises.
That said, I highly recommend you try a pair, either through a rental or borrowing some from a friend. And even if you buy a pair, you aren't out that much moneyeBay, for instance, has Snowblades for under $200. Add them to the gear arsenal you haul to the slopes, all the better for more fun!
For the season's slickest ski gear, read Outside's January reviews of 2006's top skis and snowboards.