I just bought one of the brand new Intel-based, dual-core Apple Mac Minis. It's fast!
I upgraded my Mac Mini, at the time of purchase, to 1 GB RAM and 120 GB hard drive. It has such a small footprint on my desk. It's sitting right next to my 19" flat panel monitor and looks awesome. It has 4 USB 2.0 ports and a firewire port. It has an Airport (which I'm not using) for wireless access and a 10/100/1000 Ethernet port (which was NICE for transferring data from my PowerBook at 1 Gbps.
The only problems I have with the new Intel Macs is the lack of native Intel software (or Universal binaries). But more and more software is being fixed, updated or whatever to work with the new Intel Macs.
I'm currently running a universal binary for Firefox (Deer Park) and Thunderbird I found on Mozilla's Wiki. AdiumX is a universal binary. A lot of the other applications I use come with Mac OS X.
Hopefully I'll be able to afford to get one or two more Mac Minis or Macbooks this years so I can get Windows completely out of my house. :)