There's a problem with the blog roll, in that some of the non-blogger blogs (what a mouthful) are not updating when a new post is posted. This is due to a problem with the blogrolling website.
For blogs hosted by sites other than blogger: when you publish a new post, it's advisable to go to blogrolling.com and manually update your blog by filling in the 'ping form'. Blogger-hosted blogs usually update themselves, but if they don't, please follow the same procedure. You don't need to register in order to 'ping'.