Interesting concept, but it shouldn't be called an xMac because Apple already uses the letter X in another one of its computers.

Also, 128 MB of RAM isn't enough these days, and even in a low-end machine, SDRAM is a bit too slow these days.

I'd like to see the following ports on it:
2 USB 2.0
2 FireWire 400
1 10/100 Ethernet
1 V.92 modem (internal USB)
1 VGA
analog and digital audio in and out

And give it an AGP slot. Then I'm sold. I could use a computer like that.

EDIT: forgot the modem and VGA port