Performing as a live act is something i've only done for the first time recently, so this post will evolve as i learn more.
Til then heres a few things that i've bookmarked which give a few different insights.
How tom cosm & pitch black use ableton Live On Stage
(And tom's first post with links to his overview of performing with ableton live - http://forum.ableton.com/viewtopic.php?t=55935)
Some tips from Michael Weeks - http://www.musicplayers.com/tutorials/keyboard/2006/0306_michaelweeks.php
And some touring advice from Chris Willits