Project suggestion: Aqua@home
if running a quad cpu.
Producing 8200 pts/day on my Phenom II 940 and 10,200/day on my Q9550. Decent point producer for dual cpu's also but you're looking 150+ hrs of run time, maybe a bit less with modern core 2 or Phenom II duals.
edit: another project to look at is Docking@home
. Producing around 820 pts/core/day on Athlon x2 technology.