An article on Slashdot says :
“Zone-H have recently posted the statistical breakdown of the collected website defacements from the last few years. Surprisingly, in 2007 more Linux servers suffered a successful attack than all versions of Windows, combined. Similarly, more Apache installations were successfully attacked than all IIS versions combined. A day after posting this data, Zone-H have questioned the appropriateness of continuing to operate the archive. Despite the valuable information that can be gleaned from the service, it may soon be lost to the world. The natural successor to the now-defunct Alldas archive of defaced websites, Zone-H’s archive maintains records of over 2.6 million defaced sites but may be shut down due to the continuous accusations of impropriety leveled against them any time they disclose and mirror a reported defacement.“
