They say all the good domain names are taken, but in my experience a lot of good ones are still available.
I'm using the acquisition of this domain as an excuse to add a feature to Scripting2 that allows me to map a domain to a blog post, as a placeholder.
I like this domain because the term "really simple" is starting to show up in marketing slogans. It caught on. All because RSS needed a name that made sense to human beings way back in 2001.
They also say the shorter the name the better. But names get conceptually shortened as they get more familiar. Every year since 2001, as the name "Really Simple Syndication" was repeated, the idea of "really simple" became easier to say and recognize as something good. So while the name has a lot of letters, that's only in a technical sense. The two words in it are very short, as concepts.