What do you use linux for?

[phool]

Just curiuos out there to what people use there linux machines for.
Just a workstation to do everyday tasks? Web servers? File? Voice?

I have two machines running right now, one for a PBX and one for web developement, apache,ruby, mysql, etc etc

Im constantly building new ones and redoing them.

Next on my list is a media one with mythTv, as soon as I can get a decent machine together!