In addition to the four major security conferences, most major conferences in other areas regularly include sessions on security.

Security Conferences

IEEE Symposium on Security and Privacy (Oakland) — top-tier general security and privacy conference

IEEE S & P 2010 (16-19 May 2010, Oakland, CA) — Submission Deadline: 18 November 2009
IEEE S & P 2009 (Oakland, CA)
IEEE S & P 2008 (Oakland, CA)
IEEE S & P 2007 (Oakland, CA)
Earlier Conferences

USENIX Security Symposium — top-tier system security conference

USENIX Security 2010 (9-13 August, Washington D.C.) — Submission Deadline: early February 2010
USENIX Security 2009 (Montreal, Quebec)
USENIX Security 2008 (San Jose, CA)
USENIX Security 2007 (Boston, MA)
USENIX Security 2006 (Vancouver, BC)
USENIX Security 2005 (Baltimore, MD)
USENIX Security 2004 (San Diego, CA)
USENIX Security 1993-2003

ACM Conference on Computer and Communications Security (CCS) — top-tier general security conference

CCS 2009 (9-13 November 2009, Chicago, IL)
CCS 2008 (Alexandria, VA) CCS 2007 (Alexandria, VA)
CCS 2006 (Alexandria, VA)
CCS 2005 (Alexandria, VA)
CCS 1993-2004

ISOC Network and Distributed Systems Security Conference (NDSS)

NDSS 2010 (28 February - 3 March 2010, San Diego, CA)
NDSS 2009 (San Diego, CA)
NDSS 2008 (San Diego, CA)
NDSS 2007 (San Diego, CA)
NDSS 2006 (San Diego, CA)
NDSS 2005 (San Diego, CA)
NDSS 2004 (San Diego, CA)
NDSS 1995-2003

Architecture Conferences

Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS) — this interdisciplinary conference often has interesting security papers

ASPLOS 2010 (13-17 March 2010, Pittsburgh, PA)
ASPLOS 2009 (Washington, DC)
ASPLOS 2008 (Seattle, WA)

Operating Systems Conferences

Symposium on Operating Systems Principles (SOSP) — premier OS conference, held every two years since 1967

SOSP 2009 (11-14 October 2009, Big Sky, MT)
SOSP 2007 (Stevenson, WA)
SOSP 2005 (Brighton, UK)
SOSP 1967-2007

USENIX Symposium on Operating Systems Design and Implementation (OSDI)

OSDI 2008 (San Diego, CA)
OSDI 2006 (Seattle, WA)
OSDI 1994-2006

Programming Languages Conferences

ACM SIGPLAN Programming Language Design and Implementation (PLDI)

PLDI 2010 (5-10 June 2010, Toronto, Canada)
PLDI 2009 (Dublin, Ireland)
PLDI 2008 (Tucson, AZ)
PLDI 2007 (San Diego, CA)
PLDI 2006 (Ottawa, Canada)
PLDI 2005 (Chicago, IL)

ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages (POPL)

POPL 2010 (20-22 January 2010, Madrid, Spain)
POPL 2009 (Savannah, GA)
POPL 2008 (San Francisco, CA)
POPL 2007 (Nice, France)

Web Conferences

World Wide Web Conference — the premier World Wide Web conference. Recent editions have several security sessions, as well as security-relevant papers in other sessions.

WWW 2010 (26-30 April 2010, Raleigh, NC) — Deadline: 26 October 2009 (abstracts)
WWW 2009 (Madrid, Spain)
WWW 2008 (Beijing, China)
WWW 2007 (Banff, Canada)
WWW 2006 (Edinburgh, Scotland)
WWW 2005 (Chiba, Japan)
WWW 1994 - 2004

Industry/Hacker Conferences

RSA Conference
Black Hat Briefings
DEFCON
ShmooCon
Chaos Communication Camp