Live Blogging is a plugin for WordPress that makes it easy to live blog from within WordPress. Out of the box it will let you create a live blog within the admin interface and as you add new entries on the fly, those get pushed out to the post you have indicated the live blog entries should appear.
But that still requires users to refresh the page, etc. The plugin really takes off when you combine it with the open source Meteor server, however, because the live blog updates are streamed to the post and updated in real time, so the visitor doesn’t have to reload anything.
Check out the screencast video of how this works in action.