Which Version of RSS Do I Use?

Just like anything else in the high-tech industry, the standards for RSS are evolving quickly. For now, most programs which generate feeds seem to have settled on RSS 2.0, though RSS 0.9x and RSS 1.x variants are still around. There’s also a similar standard called Atom, which is used by Blogger and some of the other blog services. Most feed readers will understand and display all of these different formats, and will in fact deal with Atom feeds even though the programs are called “RSS” feed readers.