As the title states, I'm looking for some cool things to do with an Ubuntu home server. The current plan is to use it for file storage and backups, streaming music / movies to other machines on the network, as well as being a simplified and secured box to ssh into (and resultantly the rest of my network, if I can secure it to my liking.)
Any other suggestions are greatly appreciated, and I realize that this question is slightly subjective but I think that the information will be helpful for myself and others with the same question.