list of top tamil webradio in the world?

Answer 1

This is the site you are looking for:
http://www.mikesradioworld.com/asia.html
And this one is also of importance, you can listen to live raido on your computer here:
http://www.ahusoft.com/radiochannellist.htm
http://www.tuner2.com/


You can always go to:
http://www.tamildomain.com/topsites/

Answer 2

Have you tried Kathala.com?

http://www.kathala.net/topsite/?from=0&cid=0