On ZDNet; Dion does a sound milestone analysis with some lessons that bear consolidation at this point. I repeat them here along with his graphic:
Lesson #1: Enterprise 2.0 is going to happen in your organization with you or without you.
Lesson #2: Effective Enterprise 2.0 seems to involve more than just blogs and wikis.
Lesson #3: Enterprise 2.0 is more a state of mind than a product you can purchase.
Lesson #4: Most businesses still need to educate their workers on the techniques and best practices of Enterprise 2.0 and social media.
Lesson #5: The benefits of Enterprise 2.0 can be dramatic, but only builds steadily over time.
Lesson #6: Enterprise 2.0 doesn’t seem to put older IT systems out of business.
Lesson #7: Your organization will begin to change in new ways because of Enterprise 2.0. Be ready.