Revision Control

What does /prog/ think of revision control, and what are its favorite and least-favorite revision control systems?

I use git and/or mercurial. Subversion has been a laggard as of late and is becoming obsolete compared to the newer distributed VCSes. I get frustrated now when I have to use subversion for someone elses project, svn is just slow as molasses, nor is it as intelligent.

That said, version control is mandatory knowledge if you want to get a half decent or better development job in the industry.