The Trackback Development Movable Type weblog reports the trackback capability in Manila. I'm still trying to verify that it works in Radio.

I see Mark Pilgrim has started including a revision history for each post on his weblog. This is an interesting feature, especially if you've got a group weblog or a blog tracking the status of several issues–you can bookmark the permalink of the entry, and watch that specifically, rather than going through the whole reverse-calendar order of the site to find updates. Very cool.