I've got the same fine cracks on the drivers side only. Maybe it's from skin contact. I read a thread on refinishing the. As I recall, the owner took it to a wood craftsman who said the cracks were in the polymer finish and not the wood. They could be stripped and refinished, but the veneer is thin so it's a delicate process.

http://www.xoutpost.com/bmw-sav-foru...wood-trim.html

1968_75_BMW_2800_3.0_Woodwork

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2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005