These blogs are part of the VIP blog program, which we’ve now made details about public.
The idea is that many successful blogs outgrow what they can technically or monetarily support. The seeds of VIP got started when our friend Robert Scoble was in a blog bind and we wanted to help out, but it required some custom work. We can do that for one or two people, but not three hundred and fifty thousand. However the trade off is usually worth it if the blog is prominent enough to bring new exposure to WordPress.com.
By making this program public we’re hoping to reward some people who we might not know personally (including current WordPress.com blogs) with the same sort of opportunities and benefits that our friends had. Our main focus is still new features and customization for everyone, but we’ve lowered the handholding it takes to run a VIP site to where we can make room for a handful more.
If you’re a fan of a blog struggling with growth, consider pointing them to VIP hosting and your favorite blogger can get back to worrying about content and not servers. We can’t accept everyone, but you folks have shown you have good taste in the past.