which dvcs do you use?

git and darcs here.

git for github mainly. but darcs is more simple (on how to manage on my mind)

I've been playing with Fossil[1] lately; it's pretty cool.

It's got a simple wiki and bug tracker built right in, which is nice.

Appeal to authority: SQLite uses it!

[1] http://fossil-scm.org/

lolol even Mercurial was too mainstream xd!!!