Which blog is the most stable?

Which Blog Service Provider (BSP) has the most stable website? This evaluation by Pingdom.com covers the world's largest BSPs, including TypePad, Blogger, WordPress, Blogster, Blog.com, Vox, Squarespace, Windows Live Spaces, and LiveJournal. The test examines the total downtime of these major BSPs over a four-month period from October 08 to March 09, in order to assess the stability of each blog service.