Vlogging is the video equivalent of blogging — video is the primary content, linked to a vlog post and often accompanied by some explanatory text or supporting material.  

Update for breaking news: At the Rocketboom panel at Vloggercon, Andrew Baron began by talking about how Boing Boing had been one of his main inspirations.

He ended by showing a silent clip of the opening for a new Boing Boing vlog he is collaborating on. Afterwards, he told me it would debut within the next few weeks.

The second Vloggercon, a gathering of video bloggers from around the world (more info), is taking place in San Francisco on Saturday and Sunday June 10th & 11th.  It is sold out, but there be live streaming and an IRC chat (there also are already many photos on flickr and I'm posting photos with links).  

Just look at the schedule and then watch and participate.

Friday evening at the Apple store in San Francisco,  TWIT was taping their show at the same time as a large crowd watched a Meet the Vloggers presentation (they'll now be happening every month in San Francisco).

If you can't watch live, everything will be archived, remixed, and vlogged.  You can  also learn to start you own vlog at freevlog.org (and to start learning the basics of video, check out the five-minute episodes of videogrunt  ).  Michael and Ryanne (pictured at top) created freevlog and wrote a book.There also is an archive of the first vloggercon.