UCLA Center for Digital Humanities http://www.cdh.ucla.edu/ is streaming and then archiving tweets from protesters in Cairo who are taking part in the pro-democracy demonstrations. The program was built to run on Internet Explorer 8 but also works on Firefox 3.6, Chrome and Safari. Users may view live tweets or view the archive. Locations are pinpointed.
Mashable has a useful collection of links to sources discussing the use of social media during the recent protests in Egypt: http://mashable.com/2011/02/
Some of the original research is related to analysis by Sysomos MAP: http://blog.sysomos.com/2011/Other useful blogs which cover the use of social media in political campaigns and revolts include techpresident and Netpolitique. Netpolitique is in French but many of the resources it links to are in English.