[mlinksva]

http://qa.debian.org/popcon-graph.php?packages=git++git-core...

With CVS, darcs, monotone also interesting.

[Groxx]

I keep tacking RCS onto the ends of these, too :) It keeps surprising me - Mercurial passed RCS ~ last June, and Bazaar passed it in roughly June of this year. It gets a lot of usage still.

[Estragon]

I use it pretty often for casual alteration of configuration files.

[mkopinsky]

Why do you prefer it to git or hg for this use case?