Following some nice discussions on the fine online carnatic music forum rasikas.org (link on the left), I came up with a transliteration scheme for carnatic music compositions, and an associated editor. Basically, you type in the words of a carnatic music composition be it a Tamil, Telugu, Kannada or Sanskrit composition in English and with a click of a button see it transcribed into all these languages.

The Carnatic Music Transliterator link on the left takes you to the editor. There is a link from there to a page that describes the transliteration scheme itself in detail.