From what Gizmo posted you need a specialized ASIC (I think this means Application Specific Integrated Circuit) setup. Looks like this requires the help of an EE or at least one knowledgeable mofo to even contemplate. In other words home PC users (even with a bunch of them) need not apply.
Daniel ~ notes that Bitcoin is in trouble, more so than ever.
IMHO, it's a freakin' scam. Sorry, looks like no free or cheap lunch available. It's always something.