Red Monk analyst Stephen O'Grady recently looked at projects hosted on Ohloh and found that only 13.8% of those projects are using distributed version control like Git and Mercurial. All other projects were using centralized systems like CVS and SVN. O'Grady goes on to cite many benefits in using distributed systems, and the reasons that most developers don't take take advantage of them.

I'm curious: do you use distributed version control for any of your projects? If not, why not?