In reply to KlaasW:
Oh, you do actually mean *run*, right? Certainly when I did the Lagginhorn you could have run up it, provided you're happy running up a 45 degree slope in crampons through mushy sticky snow. You could have run down it too, on the same condition, and with the added proviso that you'd need to be confident that you were going to stay in control.
This is just the upper half of the route I'm talking about--it's an open, simple, 45 degree snow slope about 300m high. Below that you have a rocky ridge, which is more like a scramble than a run (at least for me). Below that you have the approach path from the Lagginhornhuette, which is certainly runnable.
Not my bag, but if that's your thing, respect.