Micros are pretty fantastic for non-commercial use. If I'm testing some stuff out at home and need a couple different machines I can either fire up some VMs.. but I'm on a netbook.. or I can almost instantly just pull up a couple EC2 micro instances for the amount of money I find under the couch cushion next to me.

I would never dream of trying to build anything meant to stick around and make me money on one though of course.