Felix Salmon has THE chart of today's move in Swissie, a need-to-see grpahic if ever there was one. Three other charts included in that post, but the top one brings the wow-factor.
Meanwhile, your humble scribe's comment to a cyberpal on hearing the news of the Swiss Franc today was this:
"...fact is, if Switzerland is stupid enough to want a strong banking system, they're gonna have to suffer a strong currency too."