The latest file release is alpha-release-1-5. This release should improve atppc's performance when using ECP/Fast Centronics modes. The CPU utilization while printing will be lower in these mode even if printing speed stays the same (i.e. your printer's own speed is the limiting factor).
The release also includes bug fixes and updates to synch with the NetBSD kernel source. An untested ofisa (Open Firmware ISA) attachment has been added. The PPS device has also been added from the NetBSD source tree.