Up until now there have not been automatic notification of replies to messages posted here. I've just added a plugin though that should give an option for getting email notices when someone answers a post that is in your favorites. (When viewing a discussion you should see a link on the left above the first post to add a discussion to your favorites.)
I've also added a plugin to automatically add discussions that you start to favorites. I'm hoping this will give you the opportunity to get an email when someone answers you. I'm in process on testing this right now and will post back results.