Prog Archives : One of the most complete progressive rock resources. E.g. discographies of Genesis, Caravan, Niemen.
Discogs.com : Impressive database of artist's records including unofficial ones.
Gnosis : Detailed reviews of progressive rock bands with many contributors, you can search the database here. Helpful to find unknown artists.
Strawberrybricks.com : Timeline of 1967-1979 albums with a few videos.
Gibraltar Encyclopedia of Progressive Rock : The web's premier resource since 1992 for information on all Progressive Rock bands.
Free Webradio : Famous french speaking webradio directory
Internet Radio : International radio portal Radioguide.fm