I'm not familiar with this hardware, but I wonder if there is a udev rule already implemented to handle these devices. It may be that the attibutes in your rule do not all match correctly. Try simplifying your rule slightly.
Code:
KERNEL=="ttyUSB*", SYSFS{product}=="Palm Handheld*", SYMLINK+="pilot", GROUP="uucp", MODE="0660"
Note: uucp is the usual group associated with usb devices.
I know that udevinfo can be used to list the attributes associated with your device. Something like 'udevinfo -a -p /sys/class/tty/ttyUSB0' may work here.
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