This month's (December) GanGan comic comes with a Fullmetal Alchemist drama CD with it. 鋼の錬金術師 天上の宝冠 後編 (Fullmetal Alchemist: The Celestial Diadem, Part 2 of 2). It features the anime cast in an original scenario with new characters.
Edward Elric: Paku Romi
Alphonse Elric: Kugimiya Rie
Roy Mustang: Ookawa Tooru
Riza Hawkeye: Neya Michiko
Angelot Erland: Orikasa Fumiko*
Albert Hynes: Yamazaki Takumi*
* Original characters. I roughly translated the names from Japanese to English.
エドワード・エルリック： 朴 王路美
アルフォンス・エルリック： 釘宮 理恵
ロイ・マスタング： 大川 透
アンゼロット・エルランド： 折笠 富美子
アルバート・ハインツ： 山崎 たくみ
Description of Fullmetal Alchemist: The Celestial Diadem
The Elric brothers, in their search for the Philosopher's Stone, arrive in a territory governed by the Erland royal family. It's said that the Erlands rule their land with a sacred stone called Heaven's Tears that's been passed down for generations. With a chance that Heaven's Tear could offer some sort of clue to the Philosopher's Stone, the Elric brothers decide to investigate. Along the way, they rescue a young girl, Angelot (who also uses alchemy) from some suspicious figures and suddenly find themselves caught up in a huge conspiracy...
Scans of Fullmetal Alchemist: The Celestial Diadem Original Drama CDs part 1 & part 2
Part 1 of this Drama CD came with last month's (November) GanGan comic issue.
Square Enix GanGan comics official homepage link (Japanese).