What Mercurial DVCS hosting would you recommend for a small open source project?

sourceforge.net just added Mercurial, Bazaar and Git support.

I use Bitbucket for a bunch of Open Source projects and am very happy with it, too.

[update] Bitbucket stopped hosting Mercurial.

BitBucket is certainly the most popular. I've experimented it for while, then I jumped into git.