Statistics report 2005-2007
http://www.zone-h.org/content/view/14928/30/

Zone-H has some interesting stats on website defacements and the defacers' server OS of choice.

In the past the most attacked operating system was Windows, but many servers were migrated from Windows to Linux...
Therefore the attacks migrated as well, as Linux is now the most attacked operating system with 1.485.280 defacements against 815.119 in Windows systems (numbers calculated from 2000).
Awesome! The story's chock full o' charts to enjoy.

[via Slashdot]