bivnn.cgi now has a fancier interface that allows me more flexibility in "unread node management" I can selectively clear groups of nodes as I read them. It's proved to be much nicer than the "I've read all nodes" button that NN provides. It also allows me to bookmark individual nodes for later perusal.
Unfortunately, its become more than just a simple script, and will take some time to cleanly package for others to use. Until then, you'll have to settle for a sample page. The little dingbats next to each node are used to clear or bookmark nodes. They may or maynot be viewable in your browser.
-Blake