All of the computers in the house run only Linux, but with all that software, it's not very significant to all the other embedded systems I use other than my Android phone.

Things not open source: the computer's firmware, firmware on external cd/dvd drive, monitor firmware, tv, dvr, game platforms, remote controls, thermostat, cameras, gps receiver, gps satellites, my car, traffic lights, cash registers, work computers, unknown number of routers on the internet, websites, and lots and lots more.

This Fedora 13 system on the netbook: 193 process, 42 are non-kernel.

ps fax|grep -v \\[|wc -l

My Fedora 8 system locked up after the leap second update was logged at 00:00 UT. I was my DHCP server, so the network went down.