Thanks - finally got the dongle working! I'm using EasyNet from AmigaKit and for some reason it kept balking on the device. I had to manually go in and set it to usbpegasus.device in the easynet.cfg file and it started working.
I cna ping to it and form it, but I cannot seem to get Amiga Explorer running properly. It starts up in TCP/IP mode, I set the packet size to 32768 on both ends, made sure the password was correct, and even opened up port 356 in amiTCP (it logs that it accepted the connection) but I get "unable to access TCPIP port" on the PC side.
I'd say this was a pain but I'm having fun.