Training Resources:

SANS (SysAdmin, Audit, Network, Security) Institute.  SANS offers training in all major IS disciplines.
ISC2.  Home of the CISSP and SSCP certifications.

Vulnerability News and Databases:

PacketStorm.  A comprehensive "aboveground", non-commercial.security tools and info resource.
VulnWatch.  Non-commercial, open-source vulnerability disclosure list.
OSVDB (Open Source Vulnerability DataBase).  Non-commercial, open-source vulnerability disclosure list.
CVE (Common Vulnerabilities and Exposures).  A list of standardized names for vulnerabilities and other information security exposures .
ICAT Metabase.  Searchable index (by CVE numbers) of information on computer vulnerabilities.
SecurityFocus.  Home of Bugtraq.  Take note, this is a subsidiary of Symantec.
CERT.  Carnegie Mellon University.  Security incident handling, vulnerabilitiy research, alerts.
FedCirc (Federal Computer Incidence Response Center).  The federal civilian government's focal point for computer security incident reporting, providing assistance with incident prevention and response.

Local and National IS Professional Organizations:

ISSA (Information Systems Security Association).  International website.  A not-for-profit, international organization of information security professionals and practitioners.
ISSA Los Angeles Chapter.
ISSA Orange County Chapter.
ISSA Inland Empire Chapter.
HTCIA (High Technology Crime Investigation Association).  National website.  Great resource for forensics technologists.
HTCIA SoCal Chapter.
InfraGard.  Guarding the Nation's Infrastructure.  Where academia and private industry meets the DHS.

Local IT and IS related Groups:

OCLUG (Orange County Linux User Group).  Meets out of CSUF on Saturdays.
LALUGS (Los Angeles Linux User Groups).
OCNTUG (Orange County NT User Group).  Windows NT and related topics.