Gibraltar Encyclopedia of Progressive Rock - huge database of quality reviews.

Tommy's Forest of Progressive Rock - great review site!

Gnosis - Reviews and ratings (1-15) by what seems like reliable people

Progressive Ears - including a very active discussion forum.

Progressive Newsletter - in German, but they have thousands of prog links.

Italian prog - The ultimate site on Italian prog

New Horizons - reviews, interviews, news and more.

Progreviews.com - Loads of quality reviews.

Zoltan's Progressive Rock Webpage - reviews and sound clips.

Frazz recommends... - Italian prog reviews

Google Groups - Discussions about prog on rec.music.progressive

Record Heaven - Online vendor from Sweden.

Manlio Progressive Reviews - Reviews in Italian.

Raimundo Rodulfo - Latin American prog artist, nice sound clips.