Greets,

Please excuse if posted before. Just shoot me a PM and I'll delete it on command. Please, follow by with a link. Thank you.

Let get right down to it (even though I can write a whole tutorial on this but a simple link should help far better than I.):

http://Tools-On.Net/main.shtml

I found handy was the privacy tools: http://Tools-On.Net/privacy.shtml

If you have a look at the list:
Holmes/Who
Proxy Checker
Anonymous Surf
Anonymous Mail
Port Scanner
Trojan Scanner
NetBIOS Scanner

Check your network/computers vulnerability. Have fun.