Excellent all encompassing Dutch site: news, reviews, concerts. Great stuff.
Prock Rock Mag Great site with an excellent magazine, too, dedicated to all things prog – new and old
Prog Archives intends to be the most complete and powerful progressive rock resource. You can find the progressive rock music discographies from 5,521 bands & artists, 28,739 albums (LP, CD and DVD), 246,167 ratings and reviews from 29,220 members who also participate in their active forum.
Progressor.net Fantastic site detailing all the best reviews, interviews and news from the world of progressive rock & related
Progressive Ears: One of the best prog-rock forums in the world!