The Location bar task looked a fun challenge. So I opened gedit and started hacking away with pygtk, cairo and pango. Here are the results:
My list of things to add:
o Make the parts clickable
o I want to support icons [Done]
o I want to try and animate the addition of parts [Done]
o Add a navigate-back button for when the pathbar becomes too big for the allocated width.
Code is here.