It seems that the i386 package in the archive really has the aforementioned bug. I downloaded it again from a different mirror to be sure:
dreamscape:~$ wget -q http://ftp.us.debian.org/debian/pool/main/w/wacom-tools/xserver-xorg-input-wacom_0.7.4.1-3_i386.deb dreamscape:~$ dpkg -c xserver-xorg-input-wacom_0.7.4.1-3_i386.deb | grep /lib/udev/check_driver -rw-r--r-- root/root 499 2006-05-18 08:51 ./lib/udev/check_driver -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
