Some interesting pack riding information.
http://www.cyclingtipsblog.com/2011/10/golden-rules-of-crit-racing/
http://bikesnobnyc.blogspot.com/2008/04/sitting-in-and-bowing-out-art-of.html
http://www.ottawabicycleclub.ca/raceteams/firstrac
http://www.bikeradar.com/fitness/article/technique-group-support–21250
http://www.strongercyclist.com/riding-a-criterium/
http://www.cyclingtipsblog.com/2011/03/crash-prevention/#more-17910