Mac Mini eSATA hard disk modification that doesn't hack up the Mini, for those who want to keep your warranty relatively intact.

Used a NewerTech Ministack enclosure (which doesn't get the 'non hacked up' treatment) to hold a 250gb 7200rpm SATA disk.  This setup provides a *substantial* hard disk speed/capacity boost.

http://www.erebos.net/articles/macmini_esata/macmini_esata.php