Death of Osama bin Laden. Wikipedia contributors once again nail how to create a topical landing page for a breaking news event. 136 citations as of this posting. Seriously impressive.
College professors and students jump into the wiki world. It turns out that not all universities are content to view Wikipedia as an inaccurate and untrustworthy knowledge pool. Professors at various east coast schools are having students work in groups to improve entries. Sounds like a great use of all that journal access colleges have. (via Three trends that will shape the future of curriculum)