Ahh great stuff guys, I remember that indexarb site but couldn't find it tonight.
I found this site that has some interesting information from that pdf somehow, haven't gone through it all yet:
SPI Futures trading systems components of SPI200 index futures
I totally agree Mr Ed, its extremely fascinating although I'm still trying to figure out if there is any utility to this stuff. I read some on some site from that pdf that some of the program execution trades have got down to 10 milliseconds and what an improvement that is over 100 milliseconds....