There are quite a few with releasable bindings. I have the atomic 120s. As noted above, Head makes them - and Rossi has some as well. I believe Line is now making a releasable biding too. Echoing the comments above, check out www.skiboards.com
. A conservative DIN setting seems to keep fractures at bay.
I first got on a set of Rossi shorties at the insistence of my favorite instructor at Grand Targhee (George Mosher). I was skeptical. I was quickly amazed at how much info they transmitted.
As for folks who claim these are slow - I have to disagree. When carved properly, they rip on groomers. First time I got out on blue cruisers on my Atomics (purchased from skiboards.com), I took what I thought was a nice mellow test run. About 2/3 of the way down I realized I was blowing past almost everyone on the slope. My best theory is that the ease of skiing them lets you pick fast lines. Always the contrarian, I'd flip some of the comments above on their heads - unless your freinds are unusually good and fast skiers, you can probably keep up with them if you are a competent skier on ski boards/blades.
They are not the same as standard skis. I don't use them all the time. However, they are small, so I usually throw them in the car on ski days. I'll knock off an hour or so on them depending on my mood & conditions. They are lots of fun for a change of pace on grromer days. Or I'll use them if I really want to work on my carving with major ski feedback.