Wikipedia is going to implement Alfaro et al's algorithm to assign trust levels to individual chunks of text within articles based on the reputation of the author of the chunk. The interface will use color coding to visualize trust levels.
Interesting article (see http://web.mit.edu/newsoffice/2007/wikicity-0830.html) --
Residents of Italy's capital will glimpse the future of urban mapmaking next month with the launch of "Wiki City Rome,"
a project developed at the Massachusetts Institute of Technology that
uses data from cellphones and other wireless technology to illustrate
the city's pulse in real time.
There was an interesting essay in the most recent CACM titled "Why You Can't Cite Wikpedia in My Class" (http://doi.acm.org/10.1145/1284621.1284635). The author, Neil L. Waters, is a professor
of history and the Kawashima Professor of Japanese Studies in the
Department of History at Middlebury College, Middlebury, VT. He recounts how several students submitted essays to him with incorrect information on several topics in Japanese history, and how he traced the incorrect information to several Wikipedia articles.