New municipal, county, and state boundaries were recently released on NJGIN. (By the way, if you haven’t checked out NJGIN recently, it’s been updated, and OIT is working on further improvements.) I started to use them at work and they are definitely an improvement over the old dataset, however there are some significant changes and some oddities.
I wrote some notes on the changes in a KML file using Google Earth, along with a WMS service serving up the old and new boundaries. You can grab the KML file from NJ State Atlas. The old boundaries are in orange and the new boundaries are in blue. You’ll need to zoom in to view the changes; clicking on one of the pushpin “notes” will bring up my comments and zoom you into the change. Zooming in will also make the appearance of the WMS layer a little less blocky and ugly. (I set a 4 second delay in WMS refresh after panning in GE.)

I originally put this together using all vector data, but the KMZ file ended up being about 12MB and brought Google Earth to a crawl on my Mac. I still have the KMZ of the boundaries - if you’re interested, contact me.
If you’re a GIS purist and would rather look at the two layers in ArcMap, you can still get the old layer from DEP and the new layer from NJGIN.
Pan around and look for other significant changes. If you find any, annotate them in KML and send me the file. I’ll add it to my notes.
13 june: minor update to post regarding wms refresh