At Mozillaquest.com: "The Milestone 0.8.1 edition of the Mozilla browser-suite release set for today has been delayed. So, in the meantime we took a look at Friday's 0.8.1 release candidate for a sneak preview of what's new and improved since Milestone 0.8.
Check the MozillaQuest Magazine front page (mozillaquest.com) every now and then to find out when Milestone 0.8.1 is released.
One nifty new Mozilla feature in 0.8.1 that our sneak preview found is the hierarchical history. It does a nice job of organizing the URL history by days. You can add the hierarchical history to the sidebar by using the sidebar customize procedure."