Those in the New York area might want to check out a new post Daniel Krook has concerning his talk he'll be giving on native XML databases at next week's New York PHP User Group meeting.
The presentation follows a mailing list thread and resulting blog post that generated a lot of interest and discussion on the topic. It should be a great talk for database administrators, application developers and content producers alike.
According to the summary of the talk, he'll be discussing what XML databases are good for and why you might choose them over a normal database. For more information on attending, check out the NYPHP User Group website.