CoverItlive.com is a free (for now) service that allows you to live blog events and publish items directly to any publishing platform. Now this is pretty commonplace and can easily be done with WordPress (and a few extra plugins) but CoverItLive makes it easier and quicker to embed a variety of media and interact with your readers in real time. There is also an instant replay function, which as inane as that might be, might become handy at some point. Now I barely ever liveblog anything, but I can see a lot of use for this at conferences.
Have you liveblogged anything before?