Home of Gibson Research (a must visit).
http://grc.com/intro.htm

A big link list of Online Security & Privacy tests
http://www.staff.uiuc.edu/~ehowes/info17.htm

Is your computer vulnerable to the WHSMON.OCX exploit? Check here.
http://www.nsclean.com/

Test to see if you browser reveals any personal information.
http://www.pcflank.com/browser_test1.htm

Turn off HTML in Outlook 2000/2002.
http://ntbugtraq.ntadvice.com/default.asp?sid=1&pid=55&did=38

Outlook OCX Attachment Vulnerability
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q274303

Outlook 2000 SR-1 Update
http://office.microsoft.com/downloads/2000/Out2ksec.aspx

Security Update for Internet Explorer - February 11th, 2002
http://www.microsoft.com/windows/ie/downloads/critical/q316059/default.asp

Security Update for Internet Explorer - March 28th, 2002
http://www.microsoft.com/technet/security/bulletin/MS02-015.asp