Please leave them as meny as you can to share with us :D
However, my most favourite OST music composer is Kajiura Yuki.
Her most outstanding products is the Tsubasa Chronicles.
Other products include My-HiME, My-Otome, .hack//SIGN~and more~
She also writes a lot of lyrics for anime, commonly FictionJunction Yuuka and more.
The latest product from her is the Pandora Heart which going to be air soon.
You can view the official trailer and see how amazing is her music :P
Other music composer I like is :
Sagisu Shirou (Bleach),
Iwasaki Taku (Kekkaishi and Soul Eater),
Nakagawa Koutarou (07-Ghost, Code Geass, GUNxSWORD...),
Mitsumune Shinkichi (Zero Tsukaima, Rozen Maiden, Magister Negi Magi...)
Kanno Youko (Macross Frontier, Ghost in the Shell, Darker than Black...)
Any other recommended anime or game OST?
Please tell us and we will enjoy them together :P
~Thank you for peeking at my nonsense~