Hg-publishall is a mercurial extension which allows you to push simultaneously to multiple repositories, in a single command.
First, clone the repository, let's say in your home directory:
hg clone ssh://firstname.lastname@example.org/Kizlum/hg-publishall ~/hg-publishall
Then add the following to your .hgrc file in order to activate the extension:
[extensions] publishall = /Users/thomas/code/hg-publishall/hg-publishall/publishall.py
Add as many paths as you want to your repository/.hg/hgrc file, and when you want to push, use one of the following:
hg pushall hg pusha
Hg-publishall is licensed under MIT license, so feel free to hack as much as you which.
Finally, if you find a bug, have a feature request or want to submit a patch, just fill a ticket on the issues tracker.