Apple iPhone charger teardown: quality in an tiny expensive package
Source: Ken Shirriff's blog
Behold this nice article about Apple's "cube" charger.
The technical details are way beyond my comprehension - it discusses the flyback switching power supply, EMI interference, schematics and so forth.
I thought it might interest you guys since you are quite tech-savvy when it comes to PSU's.
There's a fairly large number of reference notes, so it's also interesting for that, too.
A pity there are no figures about efficiency, though.