I'm not wild about the current filler eps, but I love the ED. (And I know I should be reading scanlations. But I need that time for Kamen Rider 555!)
And on to the sexy-voiced women:
Deja Vu - Minagawa Junko. 5 tracks, 2 are instrumental.
Boku to kimi to hatenaki sora - Paku Romi. 9 tracks.
Aozora no Present - Paku Romi, Kobayashi Sanae, Saiga Mitsuki, Minagawa Junko, Iwata Mitsuo. I'm not sure what project this was from. There's one track of all the women on the song, then tracks of each of them doing a solo version. For some reason, I don't have the Iwata Mitsuo solo track, but the others are there. Saiga Mitsuki's voice is to die for. She voices Wolfram on KKM and Maria Ross on FMA, among others.