I have owned a few Psychlo-X in my day, and the first meeting of 2001 vs 2009 went as well as can be expected:
http://farm6.static.flickr.com/5052/5448856113_e4689b3f0c_b.jpg
http://farm6.static.flickr.com/5216/5449464526_2323deefe5_b.jpg
Changes: YBB vs. non-YBB, 1" headtube vs. 1 1/8" headtube.
Similarities: 2001 IF steel fork and Ksyrium SL wheels; 2008 IF steel fork and Ksyrium SL wheels (soon to change).
I will compare the tube thicknesses and clearances.
