Links for the Crumar Spirit:

Crumar Spirit - reviewed by Gordon Reid [Gordon's website]
Crumar Spirit - Same review as above - Sound On Sound website
Crumar Spirit - Info at BigBlueWave.com including patch sheet and owner's manual
Crumar Spirit - Description at Vintage Synth Explorer
Crumar Spirit - Photo Gallery and review at Blue Synths
Crumar Spirit - Music Machines at hyperreal.org

Crumar Spirit Parts Sources:

CEM chips:

Synthesis Technology
Synth Chips
Vintage Planet

MIDI Retrofit:

Synhouse MIDIjack

Other Crumar Websites:

Vintage Synths Made in Italy - A site covering many Italian-made synths, including The Spirit and others by Crumar. He has schematics for the Spirit (but a bit blurry) that he'll email for free, but he requests an optional donation
Yahoogroups.com - Crumar