How is the current Intel Mac mini offering limited, other than graphics?
There are four USB ports and one Firewire port - you can daisy-chain up to 63 devices on one Firewire port. That's 63 upgrade parts you can potentially buy right there. Get powered hubs for USB and you can add more devices that way too.
You can change the memory to go up to 2 GB, possibly up to 4 GB if memory companies make 2 GB sticks.
You can add a 160 GB internal SATA drive, pick from hundreds of external Firewire/USB2 options, or even make your own. You could even extend the internal SATA and make it
external.
You could buy a
DualHead2Go from Matrox and get
dual displays even with the limited graphics.
You can even
change the internal processor to a Core 2 Duo. Nice to know that my slow, limited Mac mini could beat a Dual 2.5 GHz G5 if I upgraded it.
I can understand why people want to upgrade, but at some point it becomes costly, and buying a new computer is cheaper. If I spent all this money to fully deck out my Mini, it'd be cheaper to buy a Mac Pro or two. Apple has to do this to keep the business viable.