Atom seems on the face of it to be a better format than RSS, but some of what it addresses are not really wide spread problems for operations. Market share will tell if it was a solution looking for a real problem or not. Atom is about 2 years old - and it is pretty common to see atom feeds available around the net now.
Measuring the breakdown among my own set of feeds that I read isn't terribly useful. I have a bias in my selections - it isn't like measuring my connectivity or transport properties where I am representative as a sample.
For the record: I have 112 feeds, 54 of them in atom and 58 in some kind of rss.
The best information I could find was from syndic8.com. But frankly, it wasn't very satisfying. The site didn't feel very complete, and in the end only showed essentially the ratio between RSS and Atom offerings. They listed about 1/2 a million feeds - 82% of which were some flavor of RSS.
What I want to know is the ratio between active usages (i.e. fetches) of the two formats. Lots of sites offer both formats - but which do users actually consume?
Feedburner clearly has this info - but I couldn't find it published anywhere.
Does anybody have more information?