Simultaneous with its new product announcements earlier this week, Canon launched Flash Work, a section of its web site that discusses in detail the flash technology employed in the EOS system.
It's an online counterpart to the ink-on-paper version of Flash Work that Canon has produced in the past, though it has been fully-updated with information on E-TTL II as well as the newest digital SLR cameras and Speedlite flash units.
Thanks to Gary Voth for bringing this to our attention.