Some changes happened to ACPI with the 2.6.13 kernel that comes with Slackware 10.2

You will have /proc/acpi/sleep missing. It has been 'deprecated in favour of /sys/power/state'

You will have to change the scripts described above.

New /etc/acpi/events/standby:
echo "rmmod uhci_hcd"
rmmod uhci_hcd

# everything before this point is sleep
echo mem > /sys/power/state
# everything after this point is wakeup

echo "modprobe uhci_hcd"
modprobe uhci_hcd

And new /etc/acpi/events/blank:
echo standby > /sys/power/state

Cheers