For those technically inclined, here’s a list of useful self help security sites that you can test your own domains:

Analyse your http response headers:

Deep SSL configuration test:

WordPress security scanner

General configuration test:

ASP.NET Security Analyser

Most new zero day threats aren’t detectable by, so it’s best to do some more in-depth analysis:

Keep your Microsoft Windows operating system and applications always up-to-date, using Secunia: