ITT We list known sites using this software and discuss.
( Sauce: http://code.google.com/p/fuuka/ )
http://easymodo.net
http://green-oval.net
Personally have found Fuuka boards rather useful in navigating and keeping track of the modern mess that is 4chan.
Seeing last created threads in static order is pretty handy and the archive is obviously useful too. Many of the embedded search functions are pretty cool too, like the iqdb and view same (image) queries.
Green-oval is Kaiji