Scott's playing with Tabs, and it look pretty good (even in Firefox, although it comes down a little strangely):
"Anywho, I was playing with the client-side code a bit and thought that it would be cool to take this concept a bit further and have collapsible-like regions for displaying parent/child data. After a lot of tweaking, I was able to create a demo that had the look and feel I wanted. "
Live demo is pretty cool to play with and think about how best to use it. Looking forward to the control version (and article)