New plugins are available at
http://supercoldmilk.com/ac3dplug/index.html
The new Layers plugin (alpha, for Windows) allows you to arrange your documents into multiple layers for easier selecting and hiding.
The Knife plugin has been improved, and now has better Undo, multiple cuts per edge, and a fix for surface properties on sliced polygons.
Enjoy, and post back here if you find any problems.
Dennis