Hiya,
I downloaded the superPI mod 1.5 XS from the http://www.xtremesystems.com/pi page and realized your web's validation checksum tester seems to be broken ( unless I'm doing something bad ). After calculating a superPI 1M and entering my validation checksum in your web validator says always "Incorrect checksum". Also tested with the 5 first world records in hwbot and got the same result.
thx!