I found the blog posting containing udev rule for the palm pilot (in my case - Handsping Visor Deluxe).
On my system, ttyUSB0 is taken by usb-to-serial converter, so I had to change the rule to KERNEL="ttyUSB[2468]" - which is not nice. Then, after some discussion in livejournal and looking at output of udevinfo, I found the difference:
< SYSFS{dev}=="188:0" --- > SYSFS{dev}=="188:1"So, the right rule is:
BUS=="usb", SYSFS{product}=="Handspring*", SYSFS{dev}=="*:1", KERNEL=="ttyUSB[123456789]", SYMLINK+="pilot"