I think one of the best set of anime related character CDs ever
released were the Rosaio to Vampire Character CDs (both the
original series and CAPU2).  I never watched this anime, and
I don't plan on watching it, but I liked most of the songs.

Each character CD comes with one character song and one cover song.
The cover song is a 1980's idol song!
The following is the list of seiyuu and their cover songs.

Mizuki Nana      Akai Sweet Pea (Matsuda Seiko)
Fukuen Misato    Toki ni Ai ha (Matsumoto Iyo)
Koyama Kimiko    Delicate ni Suki Shite (Ohta Takako)
Kugimiya Rie     Slow Motion (Nakamori Akina)
Chiba Saeko      Hanashi kaketakatta (Minamino Youko)
Kapucchu         Toki no Kawa wo Koete (Ushirogami Hikaretai)

Mizuki Nana      Desire -Jounetsu- (Nakamori Akina)
Saitou Chiwa     Shiroi Honoo (Saitou Yuki)
Fukuen Misato    Smile For Me (Kawai Naoko)
Koyama Kimiko    Sabishii Nettaigyo (Wink)
Kugimiya Rie     Say Yes (Kikuchi Momoko)
Chiba Saeko      Shinkokyuu Shite (Watanabe Marina)

The web page containing links to all the individual CD web pages is at:

http://www.usagi.org/doi/seiyuu/cd/mizuki-nana/rosario-vampire.html

For a short time, mp3s of all of the cover tracks at

http://www.usagi.org/TMP/mp3/

--
Hitoshi Doi
                         " this space for rent "
http://www.usagi.org/doi/                                    doi@usagi.org