BreadcrumbBar explorer toolbar
Paul Thurrott has posted a nice review of the latest leaked Longhorn build. In one of the screen shots I noticed a breadcrumb bar in Windows Explorer. It looked like a good idea, so I took a couple hours and wrote one to see if it was something that was actually useful. I'm not sure yet.
(Click here for the whole picture)
Essentially, you get a typical breadcrumb trail of the ancestors of the current folder, which you can click on to go directly to that folder. In addition, you can click the arrow, which presents you with that folder's siblings. Clicking on a sibling brings you to said folder.
If anyone would find this useful, please let me know and I'll wrap it up and post it.