Ok guys there is a big diference between MS "clustering" wich is basicly load balanceing for MSSQL and clustering (makeing more then one pc act as one.) I have done the latter useing linux and beowulf (both free) and a bunch of 486's, this was a neat project but not overly usefull as you will only get an advantage with programs that can multithread. You can do real clustering useing windows as your main OS but it involves *very* expensive 3rd party software.