At our shop we find one of the most useful tools to stay up to date on security vulnerabilities is the SANS @RISK newsletter.
Here is a link with more info on subscribing: http://www.sans.org/newsletters/
Is there another resource that your shop finds invaluable? Post it here or email me and I will compile a list.

Danna Asche, Cook County  This e-mail address is being protected from spam bots, you need JavaScript enabled to view it