I did the search on here just like you suggested (Weasel) and found some great info about compressor clutch repair/replacement. Katit (member) had a great write up with pics that showed how he removed his clutch and replaced it with an aftermarket one. Following his directions, I removed the clutch from the compressor, didn't even have to crack open the system. I called Adam at All For Auto and ordered the replacement clutch. Katit was right about that Adam guy, his customer service is off the charts. This is going to save me between $500 and $1400 on this repair since BMW only sells the compressor w/clutch and not the clutch seperately and of course you must crack open the system to replace the compressor. Katit posted that his worked like a charm so I am expecting the same result. I'll repost with results after repair is complete.

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2010 Lexus RX350 still new
2003 BMW X5 3.0i w/sport package w/68K miles. (gone Thank God!)
2002 Dodge Ram 2500 4X4 cummins diesel w/198K miles, custom repo truck
2009 Scion tC w/46K miles
2007 Suzuki SV650 custom streetfighter
2000 Lexus GS400 w/165K miles