"The most important implication is that the scientific method can break down."

I don't understand how this is a consequence of MW. We've always known that the scientific *community* can and does break down. The scientific method breaks down even theoretically (if you use K-complexity to assess it). And I'm not even sure that the MWI situation is a breakdown... It seems there are more than two interpretations (it's not just collapse versus many-worlds).

"There are some minor ethical implications of many-worlds itself (e.g., average utilitarianism suddenly becomes a lot more appealing) but mostly, it all adds up to normality."

Question: Does every event with two possible/plausible outcomes result in two distinct worlds? I don't _think_ that's the case -- it seems that multiple plausible outcomes also result from an ambiguous problem description (even if the situation is actually completely deterministic). It seems that the primary source of multiple outcomes in ethics is not the same as the source of multiple worlds in quantum theory -- therefore you can't sum across the multiple worlds of quantum theory to get an ethical probability of 1.

-Wm