As we've mentioned previously, the Intel Core CPU socket in the
new Mac mini is socketed. Upgrade possibilites might spring to mind. They did for the folks over at XtremeSystems, who
dramatically upgraded their mini by swapping in a 2.16GHz Core Duo for the unit's bundled 1.5GHz Core Solo CPU. Quite a performance boost!
Have a look at the play-by-play.
The Core Duo CPU on the new iMac is also socketed, while the CPUs in the MacBook Pro units are surface mounted.