You may of heard of Windows Home Server Edition. Some people on the Ubuntu Forums are trying to start a similar edition of Ubuntu, Ubuntu Home Server.
Ubuntu Home Server (UHS) will be an edition of the Ubuntu operating system which allows users to administer their home network. With Ubuntu Home Server you will be able to store all your music, songs and pictures in one central location, to access your files over the internet and to backup all the computers in your house.
The goal is to have a working release available with the upcoming Gutsy Gibbon release of Ubuntu (or perhaps Gutsy+1 at the latest).
All of the needed software is already available for Linux. All the Ubuntu Home Server project needs is a friendly GUI to tie the pieces together. I think this is a great idea!