Blogger is a blog publishing system. It was created by Pyra Labs, which was bought by Google in 2003. Although its website is www.blogger.com, the blogs it hosts are all subdomains of blogspot.com.
In December 2006, this new version of Blogger was taken out of beta. By May 2007, Blogger had completely moved over to Google operated servers.
Blogger was ranked 16 on the list of top 50 domains in terms of number of unique visitors in 2007.
Redesign
As part of the Blogger redesign in 2006, all blogs associated with a user's Google Account were migrated to Google servers. Blogger claims that the service is now more reliable because of the quality of the servers.
Along with the migration to Google servers, several new features were introduced, including label organization, a drag-and-drop template editing interface, reading permissions (to create private blogs) and new Web feed options. Furthermore, blogs are updated dynamically, as opposed to rewriting HTML files. - Wikipedia