I'm mich. I do some of the web dev work for this website. As you've no doubt noticed, YDN has been updating things recently. It's taken a little while to get it out to all Yahoo! Developer Network pages (we're probably about 90-something % complete), but we're getting there. This week we finished migrating the blogs to the new design. Hopefully you already know that we currently host three blogs here on developer.yahoo.net: the YDN Blog (which you are currently reading), YDN Theater for video, and the Hadoop Blog.
Everything should pretty much be the same, but you will notice that I created new MyBlogLog communities for YDN Theater and the Hadoop Blog. Previously, these were combined with the YDN Blog community. Now each blog has its own distinct community of people sharing an interest in that particular blog.