I noticed that B&M is now selling a very nice AC->DC converter for cycling called the E-WERK. As the E-WERK is only supposed to be compatible with unregulated dynamos I contacted B&M about the regulation of the S12 and their response was:
Originally Posted by B&M
12 V at 6.2 W are only the nominal values for the dynamo - if you go faster and faster, the dynamo will be able to supply much more energy, and the E-WERK will take and use it.
I have to say that I'm very tempted to drop the 500 big ones for the S12 along with the E-WERK. Looks to be quite a useful combination for powering just about anything which can be reasonably powered by humans and more importantly has the quality construction necessary to survive the road vibration and general outdoor abuse of cycling in general.