Upgrade your MiniMac HD
The standard MiniMac uses a 4200rpm 2.5 inch "notebook" drive (either Toshiba or Hitachi). These can be upgraded to either a Hitachi 7K60 7200rpm or Seagate Momentus 5400rpm 100GB HD's
You'll find
this link useful I'm sure.
I'll be upgrading my Mac soon (if funds allow ~ sacrificing flying funds).
Good luck.