One of my favourite rAgas certainly.I like ssi's rAga alapana ,mmi's tatvamariya. When I was in school I felt electrified while hearing santhanam rendering guruvAyoor appane (ambujam krishna composition). Also enna punniyam seidhenO by OVK , incidentally sung in lot of nAmasankeerthanam is wonderful.
Go to the link http://www.sangeethapriya.org/%7Etnbala/
and download the TS Balakrishna sastrigal ThyagarAjaKshetranam.zip . He talks for the first 45 minutes on Dwaithamu sukhama , incidentally it is an english kalakshebham. Absolute bliss, with TSBS lucid explanation, you will like it more...