I like NewtWorks and NewtsCape as far as software packages go. There's a lot of other stuff I have backed up that I need to try and haven't gotten around to yet.

One software package I really like is Avi's Backdrop. I had the backdrop set to Extras for a while, but Avi's is a nice background/starting point for Newton OS.

Also note that Hiroshi's driver for wireless cards is officially shareware, but Hiroshi went incommunicado years ago and there is no way to register the driver to get WEP support. Annoying but that's the way it is for now...