http://www.quillpad.com/tamil/
this is a site from tachyon technologies is a excellant tool, for transliteration to many indian languages (tamil, telugu, malayalam, hindi, marathi, kannada).
it easier than never before..
It just took me 10 seconds to type this, and I got it right on the first time!!!
anbum aranum udaithayin ilvalkai
panbum payanum athu
அன்பும் அறனும் உடைத்தாயின் இல்வாழ்க்கை
பண்பும் பயனும் அது