Most people have clothes in their closets. Well I have old computers that I have turned into servers in mine. It acts as a print server, file server, and surveillance machine where I run my cameras to.

evil gramps is still a faggot
http://www.xoxide.com/smartfan.html
ah jesse shut up it makes your hardware last longer if you keep it running cooler
ah, nice bud, I saw a pc a guy had at the lan party that he had put 6,000 into it and he had a pico atx board in it with a like... 10 inch screen in the front of the case.. and then he had his main pc in it he used the pico board n stuff for files and stuff (lan party file ripping from others) so it wouldnt deplete his other systems resources honestly it was pretty cool.
The only person I know that worries about cooling everything down.