= !BitBucket =

 http://bitbucket.org/

!BitBucket is a Mercurial repository hosting service with a project view similar to Trac in spirit.

As they say:
 '''Develop code as a team. Keep all your development in one place, be it issue tracking, documentation or sharing code.'''

Lots of good stuff to steal there ;-)

Among other things, they use WikiCreole all over the place, the same way Trac uses its own Trac WikiFormatting everywhere.
Furthermore, the wiki is itself stored in a secondary Mercurial repository, much like described in TighterSubversionIntegration#Aprivaterepository.