Interesting post on 2channel running down a list of currently popular idol seiyuus:
2010 popular idol seiyuus
If you know more than eight, you've got it bad. (I know them all....)
Hirano Aya -- model idol-seiyuu activities. many antis.
Mizuki Nana -- always in the music charts. also quite active as a seiyuu.
Kugimiya Rie -- from shotas to tsunderes. her addicts are many.
Inoue Marina -- no model's face, but wide-ranging talents.
Chihara Minori -- became famous as Nagato Yuki. most active as a singer.
Koshimizu Ami -- became known by her strong performances.
Horie Yui -- past her peak, but with undimmed popularity.
Hikasa Youko -- got her break with K-On. aggressive performer and voice.
Hanazawa Kana -- despite some dead-voiced performances and a (blabbermouth) boyfriend, her real ability is helping her grow into Osawa Office's next ace.
Tomatsu Haruka -- she has real ability, but her agency over-promotes her, and she has many antis.
Yuuki Aoi -- began as a child actress. increased visibility since 2009 has her popularity shooting upward.
Itou Kanae -- Amu-chan (in Shugo Chara). won a new seiyuu award and is riding the wave.
Kitamura Eri -- many talents, wide acting range, and real ability. but her image is still weak.
Toyosaki Aki -- began to stand out in 2008. now one of the young seiyuus riding the wave.
Taketatsu Ayana -- got her break with K-On. I"m Enterprise's new weapon.
Iguchi Yuka -- got her break as Index. Osawa Office's new weapon, but not blessed with roles.
Kanemoto Hisako -- stood out in Sora no Woto. chosen to play Squid Girl this fall (a role Iguchi Yuka was expected to get). a new seiyuu riding the wave.
Gotou Saori -- still invisible.
Here are their photos, in the order listed (l-r):