Apart from the song "namakkini bayamEdhu" which is based on the raga kalyAni, there are few more superhit songs of PUC, two of which i can recollect immediately are


1. Nadai alankAram KandEn - KaraharapriyA (superb)

2. Chandrodhayam idhilE - ShankarAbharanam
(i personally feel this is the greatest tamil shankarAbharanam song in its pure form that i ever listened to, though there are lots of songs based on that scale. (of course, another greatest song on the raga is the well-known superhit telugu movie shakarAbharanam and the song "OmkAranAdhAnu".