Hi,
Where can I subscribe to get virus alerts on a weekly basis from Symantec so that I can make sure that my environment is updated with the correct signatures?
You can subscribe
http://www.symantec.com/security_response/landing/threats.jsp
http://www.symantec.com/xml/rss/listings.jsp?lid=latestthreats30days
Add yourself a bookmark to following page as well:
http://www.symantec.com/security_response/definitions/certified/
here you can see what has been added in recent AV defs and what is the recently released revision.