One of the best security sites on the net

[Forumadmin]

Find it here
http://grc.com/default.htm

Go to "shields Up"

And perform a port scan on your pc to see how exposed you are. :D

There are also many other great tools to test your strenght.

And another
http://scan.sygate.com/


And good old Symantec
http://security2.norton.com/us/home.asp?j=1&langid=us&venid=sym&plfid=20&pkj=RRGEWYDMGJCDBXWVPGC

Enjoy