For all those who enjoy Tamil music and can´t get it easily, here is a radio station which has lots of variety in good quality.
Tamil Radio http://www.fmworldmusic.com/
It will start automatically with the latest songs but it also has different categories: one for A.R. Rahman, Ilayaraja, Harris Jayaraj, oldies, devotional, christian and a dozen odd others. You can navigate through these options by placing your cursor over the numbers. You can skip songs you don´t like even though it is a radio.
So if you have a good internet connection, go ahead and listen!