プリキュア5、フル・スロットル GO GO / 光 / 儚くも永久のカナシ / Butter-Fly / 空色デイズ / 白夜～True Light / Summer rain / スピカ / Shangri-La / 地球防衛組応援歌
Precure 5, Full Throttle GO GO (Precure 5 GO GO)
Hikari (Kingdom Hearts)
Hakanaku mo Towa no Kanashi (Gundam 00 Second Season)
Butter-Fly (Digimon Adventure)
Sora Iro Days (Tengen Toppa Gurren Lagann)
Byakuya ~True Light (D.N.ANGEL)
Summer rain (Cross Game)
Spica (Tsubasa Chronicle)
Chikyuu Bouei Kumi Ouen Uta (Zettai Muteki Raijin-oh)
Edit (April 14, released day): According to this entry (Mandarin), Shangri-La was not the one from Shoukyuu no Fafner, but from Kuchu Buranko!
Those are mostly the theme songs that are the works he had roles of, like Gundam 00, Cross Game, D.N.Angel, Kingdom Hearts, etc. I'm especially glad that he's doing Spica (I liked this song from Tsubasa).
It was mentioned briefly in this entry (by hiroki_chan).
Edit (July 20, 2010): I know it's way late, but I found a video uploading it to youtube. This is for those who still haven't listen to it.