This seems to be a nifty tool for looking at the security of your domains.
It gives you info on web server details, Related hosts, DNS lookup information, HTTP Headers information, WHOIS info, email addresses (easy for spammers to harvest), external images, and external links found.
If you point it a blog, it will yield masses of information about version security, etc.
Sucuri.net
Security scanning tool asesses your site's security
Linear Mode
