OK let's see bands I know about (and/or have listened to):
Amon Duul II
Anekdoten
Ange
Argent
Atoll
Attention Deficit
Ayreon (got all of course!)
Bozzio/Levin/Stevens (got both albums)
Cairo
Caravan
Cast (!!!, they played here 3 years ago)
Curved Air
Cynic
Devil Doll
Dream Theater (got all albums)
ELP (got two compilations)
The Flower Kings (got all albums, TFK rules!)
Focus (got three albums)
Genesis (got one album)
Gentle Giant (got a compilation)
Glass Hammer
Goblin (got an excelent compilation)
Gordian Knot (got both albums)
Jethro Tull (got one album)
Kaipa
King Crimson (got two albums)
Liquid Tension Experiment (got both albums)
Magellan
Mastermind (got 5 albums)
Renaissance
Siege Even
Sinkadus
Van Der Graff Generator
Yes (got two albums)
I can't believe these guys skipped PINK FLOYD!!!!, Camel, Rick Wakeman, Magma, Gong, PFM, Uriah Heep, Transatlantic, The Tangent, Explorers Club, Karmakanic, Isopoda, Planet X, Ten Jinn, Waterclime...
Oh well, still a very nice site, thanks for the link
NP: Pariah - 'Promise Of Remembrance'