Why? Because I have a blog.
An old HP desktop system running a P4 processor, 1.5 gb ram, a 40 gb drive for root and home, 250 gb drive for music, pictures, etc. This system is running Arch Linux with KDE for the desktop environment and is hooked up to the TV for emulation, karaoke, videos and so forth. It's now running tonido's personal cloud server, rtorrent, mpd with music streaming, and ssh access.