I have decided to try co.mments. If a user clicks the co.mments link, their services will track comments, without users entering other comments having to do anything special.
I wrote a plugin for LifeType to automatically add the co.mments links for each post. I am interested in seeing how well this works. I don't know how well it will parse the comments. If they define some tags to be put in the comments, I will modify the plugin.
Right now it is check into svn, I will update the wiki as soon as it is posted on sourceforge.