Online security check

How good is my firewall
List of trojan ports
Digital Control Systems Passive TCP Port Scan Slow connection, quick results
McAfee Free online scan W32/Lovsan
PCFlank Tests ports,trojan and browser Quick, stealth, browser, trojan , exploits tests and  advanced port scanner
Pcinternetpatrol short test  
SEC-Net Swiss site (tests in German) Good . Up to 20 minutes
SecuriScan Quick results Checks your system for the status of 23 popular ports.
WindowSecurity Eventlogs. Email security  
Obit "Free scan" or "Obot Quick scan" This scan does not check the security, but simply gives a quick report of possible problems
Computer Cops UDP Port Scanner Slow but good
Hackerwacker Quickscan and more Nice