MacRumors.com

Apple has updated the Mac Mini to include all Core Duo models. Other than the processor upgrade, there does not appear to be any differences between the previous Mac Mini and today's release, including pricing. The Mac Mini is available in two offerings:

1.66 GHz Mac Mini
60 GB 5400-rpm SATA Hard Drive
Combo Drive
$599 USD

1.83 GHz Mac Mini
80 GB 5400-rpm SATA Hard Drive
Superdrive
$799 USD

Both models feature:
-2MB Shared L2 Cache
-512 MB 667 MHz DDR2 RAM standard (up to 2 GB supported)
-GMA 950 Integrated graphics
-1 Firewire 400, 4 USB 2.0
-Optical Digital/Analog Audio In/Out
-Gigabit ethernet
-Airport Extreme and Bluetooth 2.0+EDR standard

The new Mac minis are available at the Apple Store.

Of note, the Mac Mini still uses Core Duo (Yonah), not the more advanced Core 2 Duo "Merom" chip found in today's iMac announcements.