One sunny day I went outside and tested glossy and matte lcd side-by-side. I had the same results as described here:
http://netwalker.nl/2007/07/28/glossy-vs-matte/
Glossy was better. (lcd panels were from different manufacturers, so my results may not apply to every case)
edit: unlike in the linked blog-post, backlight intensity of both lcd-s I tested was roughly the same.