How can I make a meta-liveblog?

most of those events you are talking about use twitter, ping.fm, and other existing services. So you can have RSS integration.

Are you asking how to program in .net php java??? Have a MYSQL database or sqlite DB to put the updates in? That's really what you need to have is a interface for your commentary that lets you add updates (records in the database), then a webpage or XML/RSS output page for the websites or internet users to subscribe too that reads the database in reverse order (decending) so the newest post is read which is most cases is the last entry in the database.

There are tons of examples on how to create a RSS feed, just a simple google. You on the other hand will need to have a web server that has server side scripting like .net (IIS for Windows) , php (windows or linux) and a database to write to and read from.

If you watch CP live video the song titles for the chiptunes is actually RSS based. Which yours truly wrote based on an example I found. All I do it read the now playing, compare to previous if its a new track I inject it into a mysql database. What CP reads is the RSS feed that supplies the most recent 20 entries from that same database. Again I had to write code to write the data (in your case the commentary) and more code to create the RSS on the fly that reads the database and creates the output.

You can use twitter to read the public time-line of your twitter account and use the for commentaries as well I have several twitter chats I follow through out the week, beats having to write a few hundred lines of code. hmm mabey I could make the music titles go to twitter (yes I could, but I dont want them to control it. heh).