Actually, wasn't vaidehi Raman was picturized? If I remember correct, it had Radhika dancing. If you watch Radhika's nameless crimes on bharatanatyam and Sarathbabu's crimes on acting, you'd wish it was left unpicturised.

A few important ones that come to mind
Manippoor Maamiyaar(Rasigane en arugil vaa, samayal paadame)
Africavil Appu(putham pudhu kaalai redux)
That Venkat Prabhu acting debut had a decent song(poonjolai?)
Manidha jaadhi(couple of nice songs)
Oru kanam oru yugamaga(nadodi thendral)
Edhedho ennam valarthen(punnagai mannan)
Kaadhal Jaathi - outstanding album sadly left unreleased