One of my goals for the Enterprise 2.0 Conference was to figure out if enterprise 2.0 is the same things as knowledge management. I want to think this over for a few days and let the effects of "drinking the kool-aid" at the conference wear off before coming up with an answer.
I certainly found a lot of common themes and common purposes. Both want to foster better collaboration, and in the process create more searchable and reusable content. As Jessica Lipnack pointed out in her session, it is mostly about the people, not about the technology. They are about getting people working together, interacting and finding each other.