edited

Test your system/network against Internet vunerabilities:

http://www.securityspace.com/smysecure/categories.html (best)

http://www.shavlik.com/security/features.asp

http://www.sdesign.com/securitytest/ http://www.it-sec.de/vulchke.html

http://www.cablemodemhelp.com/portscan.htm

http://www.mycgiserver.com/servlet/kalish.Security

http://www.pcflank.com/