Twitter feeds
http://twitter.com/cnnbrk/haiti (from CNN / requires manual refresh)
http://spy.appspot.com/find/%23haiti?latest=100 (aggregation from a number of sites / works best on Firefox / automatic refresh)

Wikipedia
http://en.wikipedia.org/wiki/2010_Haiti_earthquake (refresh often for more updates and edits)

Google social media updates
http://www.google.com/search?q=Haiti+earthquake&hl=en&safe=off&client=safari&rls=en&tbs=rltm:1&tbo=u&ei=zfJNS67oAtP0_Ab29byfDg&sa=X&oi=realtime_result_group_more_results_link&ct=title&resnum=9&ved=0CCYQ5QUwCA (this is updated every second automatically)

News services
http://news.bbc.co.uk/2/hi/americas/8456322.stm (live updates from the BBC)
http://www.youtube.com/results?search_type=videos&search_query=Haiti&search_sort=video_recently_uploaded&suggested_categories=25%2C10%2C22 (for videos from news services and citizen journalism)
http://www.google.com/search?hl=en&safe=off&client=safari&rls=en&tbo=1&tbs=nws%3A1&q=haiti+earthquake&aq=f&oq=&aqi= (Google News aggregation of news updates on earthquake / refresh for updates)
http://edition.cnn.com/SPECIALS/2010/haiti.quake/ (CNN special page to cover earthquake)

UN + Reliefweb
http://www.un.org/en/peacekeeping/missions/minustah/index.shtml (MINUSTAH page)
http://www.reliefweb.int/rw/rwb.nsf/doc106?OpenForm&rc=2&cc=hti (Latest updates from Haiti / response times slow on account of traffic)

Blogs
http://www.google.com/search?q=haiti+earthquake+UN&hl=en&safe=off&client=safari&rls=en&tbs=blg:1&tbo=u&ei=w_RNS8iNIZ_J_garmuX2Bw&sa=X&oi=blogsearch_group&ct=title&resnum=14&ved=0CC8QrgQwDQ (refresh for updated blog posts, aggregated by Google)

Crisis Information Management
http://haiti.ushahidi.com/ (Ushahidi implementation has vital information up)

Wikis for aggregation ground info and help
http://mobileactive.org/earthquake-haiti-how-you-can-help-and-learn-more (by MobileActive.org, well populated)
http://globalvoicesonline.org/specialcoverage/haiti-earthquake-2010/ (by the hugely respected Global Voices, updated regularly)

Crisis Information Management Providers
http://blog.ushahidi.com/index.php/2010/01/13/haiti-earthquake/ (Ushahidi's efforts to respond to the earthquake)
http://wiki.sahana.lk/doku.php/haiti:start (wiki to help set up Sahana in Haiti)

Mapping data / Imagery etc
http://crisiscommons.org/wiki/index.php?title=Haiti/2010_Earthquake (set up by Crisis Commons)

Please urgently pass on to friends and colleagues in need of the information here.