Blogger is finally gearing up to flip the switch from Atom 0.3 to Atom 1.0. Among the changes currently being rolled out to a limited number of Blogger users is a switch to Atom 1.0 as the default feed format. RSS 2.0 will also be available. Once the new system gets rolled out to all Blogger users, Atom 1.0 should overtake Atom 0.3 overnight to become the second or third most common feed format.