Favourites at the moment:
Orchestral Game Concerts 1-5, excerpts:
Fear of the Angels (Seiken Densetsu 2), Hiroki Kikuta:
http://www.rpgfan.com/soundtracks/ogc3/10.rm
Theme of Chrono Trigger, Yasunori Mitsuda:
http://www.rpgfan.com/soundtracks/ogc5/12.rm
Theme of Albert Odyssey, Naoki Kodaka:
http://www.rpgfan.com/soundtracks/ogc3/13.rm
Medley from Kirby's Super Deluxe, Jun Ishikawa:
http://www.rpgfan.com/soundtracks/ogc5/01.rm
Meridian Child (Seiken Densetsu 3), Hiroki Kikuta:
http://www.rpgfan.com/soundtracks/ogc5/11.rm
Distant Mountains and Rivers (Nobunaga's Ambition), Yoko Kanno:
http://www.rpgfan.com/soundtracks/ogc2/07.rm
Visiting the Harbors of the World (Unchanted Waters II), Yoko Kanno:
http://www.rpgfan.com/soundtracks/ogc4/07.rm
Opening Theme (Wizardry V), Kentarou Haneda:
http://www.rpgfan.com/soundtracks/ogc2/10.rm
Complete tracklists (Zelda, Mario, Metroid, Fire Emblem, FF III-VI, DQ...) of a.m. 5 albums with more excerpts and reviews:
http://www.rpgfan.com/soundtracks/ogc1/index.html
http://www.rpgfan.com/soundtracks/ogc2/index.html
http://www.rpgfan.com/soundtracks/ogc3/index.html
http://www.rpgfan.com/soundtracks/ogc4/index.html
http://www.rpgfan.com/soundtracks/ogc5/index.html
And besides that...
Main Theme (Monster Hunter), Masato Koda:
http://www.youtube.com/watch?v=XhDK0Krdabo&feature=related
Revived Power/Battle (Shadow of the Colossus), Ko Otani:
http://www.youtube.com/watch?v=woi3jNc13nk&feature=related