What game has the soundtrack which is your favorite? For me, it would have to be Snatcher, Policenauts, or YU-NO: The Girl Who Chants Love at the Bound of This World. It's impossible for me to have only one favorite.

Okami, .hack series, Final Fantasy Type-0 and Shadow of the Colossus have some pretty sweet soundtracks.

tossup b/w the persona 3 and persona 4 OSTs

I have to say that the legend of Zelda series has probably the most original good soundtrack I've ever really listened to in a game. Ah! and of course FFX. Becuase FFX was simply epic! =P

I would have to say Okami, OkamiDen, Shadow of Colossus, Legend of Zelda (series) (i prefer Ocarina of time), and Processor Layton (series)
I love okami music.

Hmm... I don't understand why no one has commented on your videos. I like to think it's because they don't have much to critique you on. I must say you got a great pair of ears. The harmonies are quite nice. It kinda gives a improv feeling but it's clear that you practice. Do you just memorize it or does the song always change? Whatever the case is.... i enjoyed THEM

Pokemon series, FFX, and Kingdom Hearts. Also, Tales of Legendia has a beautiful soundtrack but it gets overshadowed by its mediocre gameplay.

Final Fantasy IX makes me nostalgic. The original Pokemon Gold/Silver has that 8bit charm. There are many more great soundtracks that I like...

If you count fanmade covers I will have to go with Touhou.
If it's all about the original soundtracks... World of Warcraft.

I haven't played the Touhou games, but I agree that there is good fanmade music because of it.

A few by IOSYS:

Candid Telling You: http://www.youtube.com/watch?v=CA9yZBYP75E
Unlocked Girl: http://www.youtube.com/watch?v=9MZCMDHaP3s
Miracle Hinacle: http://www.youtube.com/watch?v=ICpRT855-DI

Personally I love all the piano and guitar renditions the best

Check out this playlist I made as an example:
http://www.youtube.com/playlist?list=PLieN1MJ3Iv_P9NbDHqK-__VdEm5BRtj2D

I listened to your playlist. Some beautiful pieces and a few jazzy ones too. The saxophone solos in track 14 were great.

I recognised a few of the themes but as I said I haven't played the games so I don't know the originals.

Yep.

Guilty Crown sound track http://www.youtube.com/playlist?list=PLE74E04CB0DA0BE05