Conferences and User Groups SANS and GIAC Training http://www.sans.org USENIX Security Symposium http://www.usenix.org/events USENIX Large Installation Systems Administration (LISA) http://www.usenix.org/events/l Delaware Valley ISSA http://www.issa-dv.org/ Infragard National  http://www.infragard.net/ Maryland  http://www.mdinfragard.net Philadelphia  http://www.infragardphl.org/ Security Conferences 2010 http://www.iacr.org/events/ http://www.securityinfonet.com/Security_Conferences_and_Seminars.htm http://faculty.cs.tamu.edu/guofei/sec_conf_stat.htm  Rankings