Links to lens testing websites...

http://olegkikin.com/lenstests/
http://photodo.com (old version: http://old.photodo.com)

http://luminous-landscape.com/reviews/

http://photozone.de/8Reviews/

http://www.fredmiranda.com/reviews/

http://www.photo.net/equipment/

http://www.photosig.com/go/articles/browse?id=33244

http://www.16-9.net/lens_tests/

http://www.slrgear.com/reviews/showcat.php/cat/2

http://www.digitalfan.de/reviews.html

http://www.pikespeakphoto.com/canonlenstst2.html

http://www.rickdenney.com/mother_lens_test.htm

http://www.lensplay.com/lenses/lens_list.php