The ip.blog is nicely integrated in many ways to the current IPB forum. One way it is NOT well integrated is that new posts to BLOG don't show up as new posts on the forum.
This may in fact be designed behavior, as some may prefer that their blog posts NOT show as news.

For now I have copied a kludge from http://forums.invisionpower.com/index.php?showtopic=199997 and re-imported the BLOG RSS stream as an incoming stream to the News section of the main forum. Then the individual news items are linked back to the originating blog(s).