All future Paint.NET-related blog posts will now be posted at: http://blog.getpaint.net . If you are currently subscribed to this blog (that is, http://blogs.msdn.com/rickbrew) then I invite you to subscribe to this new one! I will still continue to post here for other topics.
Also, you'll see over there that a new beta release is available! http://blog.getpaint.net/2007/05/29/paintnet-v308-beta-is-now-available/