The real reason is that git has Linus behind it, of course, and the fiasco with BitKeeper attracted a lot of attention. This led to tremendous buzz, and then the Ruby / Rails communities* (among others) started spreading and amplifying it. I see tons of blog posts about how git is the best thing ever, and it's a freaking version control system, you know? It's sort of like if people suddenly got singing-and-dancing-in-the-streets excited over a somewhat better version of make, or something. Think about that.
There are other DVCSs that are also quite good (I like Mercurial, for one), but a pretty good version control system can't compete with a pretty good version control system with a tidal wave of hype.
* Also, since the Rails people are themselves working on a popular web development system, they probably had a disproportionately large amount of influence among bloggers in tech circles.
The real reason is that git has Linus behind it, of course, and the fiasco with BitKeeper attracted a lot of attention. This led to tremendous buzz, and then the Ruby / Rails communities* (among others) started spreading and amplifying it. I see tons of blog posts about how git is the best thing ever, and it's a freaking version control system, you know? It's sort of like if people suddenly got singing-and-dancing-in-the-streets excited over a somewhat better version of make, or something. Think about that.
There are other DVCSs that are also quite good (I like Mercurial, for one), but a pretty good version control system can't compete with a pretty good version control system with a tidal wave of hype.
* Also, since the Rails people are themselves working on a popular web development system, they probably had a disproportionately large amount of influence among bloggers in tech circles.