Last generation (about 6 months old) :
1.66Ghz Core Duo
DVD-R/CDRW combi drive
512MB RAM
80GB HDD
802.11g
Remote
Boxed, invoice and fresh install of OSX included.
I've been using it as a media centre box, but I'm going to upgrade to the fastest available model to run as my NAS / torrent / web box too.
What's it worth?