I recently attended the WebVisions 2008 conference in Portland, OR. It was my first conference, so I can't speak to the quality with much experience. However, my general opinion was that there was some good, some bad, and some ugly, as one might expect. That said, the good was well worth the experience. Plus, I won the grand prize raffle: Adobe CS3 Premier. Although, as of the date of this post, I have not yet received it.
You can find the podcasts of the presentations and the associated presentation slides with these links: