I'll start this off by reviewing 3 of the most famous albums..

His Highness AbdullahMD: Ravindran)

pramadavanam (KJY) - an excellent light song (jog based)
deva sabathalam (KJY,Sreekumar;KJY,Ravindran) - a ragamalika jugalbandi; kind of a competition song.
naadha roopini (Sreekumar) - national award winning song, based on Kanada.
Sreekumar does beautiful jet-speed swaras.
gopika vasantham (KJY,Chitra) - another beautiful duet song (shanmugapriya)
tu badi (KJY) - light hindi song with Kafi shades

BharathamMD: Ravindran)

gopaangane (KJY,Chitra) - light nattai song
Rama katha (KJY) - Great piece by KJY. Set to subhapantuvarali. (I think KJY won national award for the whole album.)
raghuvamsapathe (KJY) - pure classical shankaranaranam with alap,swaras,thani.
srivinaayagam (KJY,Ravindran) - nice hamsadhwani classical song
? (BMK,KJY) - a kind of 'music teaching' song. Starts off in Mayamalava gowla and goes into a ragamalika.

SargamMD: Bombay Ravi)

raagasuthaa rasa (KJY,Chitra) - tyagaraja keerthana nicely done filmy style.
kannaadi aadhyamaayi (Chitra) - good light song in mohanam.
sangeethame (KJY) - saramathi based one.
Andolanam (KJY,Chitra) - melodius duet.
Bhooloka Vaikunda.. (KJY) - KJY sings with lot of modulation in voice, unusually.
krishna krupa saagaram (KJY)
pravahame... (KJY)

I haven't heard this album much, so others please elaborate.