SublimeHg
Requires Mercurial 1.9 or later
It's functional, but needs some more work.
https://bitbucket.org/guillermooo/sublimehg/overview
Features:
* Uses the new command server in Mercurial
* Frequent commands should work fine
Bugs:
* Probably a few. Only tested on Windows 7.
* Cannot commit files with spaces in their path if entire path is specified (use "commit" instead of "commit (this file)" or wildcards from the cmd-line)
* Adds extra quotation marks to commit messages
(Also, hg-git is broken for Mercurial 1.9, so I cannot commit to the org until a patch is released.)