Shoutbox

Tomorrow I am receiving an older business level server that was not needed anymore and was wondering if anyone had any suggestions as to some ideas i could use it for. I am very keen to learn and experiment with some uses either for home use, sharing with friends, or maybe even host some local business websites to gain some experience.
From what i have been told it sounds like it has reasonable specifications for what i would be using it for as far as i know just to play around with. I have been told it has 4 x Xeon processors, 6 x 18gb hardrives and another 9 x 18gb harddrives on a RAID controller, and is running windows server 2003.

Can anyone suggest some practical and useful ideas i could look into for home use or anything else? or giving permission to friends to upload files for each other to share between each other etc?

Any info and/or links would be greatly appreciated.