Picked up a 4 GB SSD pulled from a Dell Mini 9 for $8.50 (shipped) on eBay. Now I will have boot drives for OS X, XP and Ubuntu. Not exactly triple boot, but the changeover only takes a few minutes.
The MIOS studio software that is used to program the Midibox SID is unsupported on Mac OS X, but works under Linux, so this will provide me a way to reprogram my MidiBox SID after I upgrade the processor.
--tom