I was able to connect my SE/30 via Etherwave adapter (connected to the serial port) to the iBook running Panther via Appletalk. To be correct, I can conncet to SE/30´s volume (hard disk) in the Network folder as a guest and then I am able to access all files on the SE or to drag and drop files on its volume.

All this might not work on newer versions of Mac OS X, though.

Maybe running BasiliskII/Sheepshaver could help you connecting to the SE/30 using an older and more compatible version of Appletalk?