If I manually modprobe the visor driver, it does appear to recognize that the palm is on ttyUSB0 and ttyUSB1, but then when I press the hotsync button I get an error in dmesg that says
"usb 1-2: palm_os_4_probe - error -110 getting connection info"
which seems like a problem.
I'm going to try to reboot, and then try pilot-xfer instead of jpilot.