What to do?
 

I have been given a rack mount thin server. As of now it has a Celeron 2.66GHz, 3GB memory, 200GB HDD, and running Windows Server 2008. I am going to upgrade it and put in a P4 550 3.4GHz w/HT in it and also upgrading the HDD to possibly 1TB (the OS is on an 80GB hdd). What should I do with it? I have been trying to think of something useful and am at a loss.

Give me some ideas people...and no I am not going to be a mirror site for pr0n. :P

EDIT: Also internet speeds 20Mb down and 8Mb up

Spadje

Install every role possible on Server 2008 enterprise and then have it run for no reason!

I don't think it's really possible to answer this question.

Is it for personal or professional use?

Personally, I don't bring a server online unless I have a specific use for it. And there are simply far too many tasks and I doubt anyone here can name all the uses a server could have.

Just a few off the top of my head:
NAS
Backup server
Domain controller
WSUS server
DLNA Server
FTP Server
Web/http server
SQL database server
Network firewall, DHCP server
Terminal Server

And there are other things like radius servers and other specialized tasks as well.