Saw a good site with lots of song lyrics, http://guruguha.wikispaces.com/. Checking out Blogger's support for Indic languages and copy-pasting between languages, here goes....
यह हिन्दी में है - Yeh Hindi mein hai
ഇതു മലയാളത്തിലാണ് - ithu malayalathilAnu
ఇది తెలుగులో - idi telugulo
ಇದು ಕನ್ನಡದಲ್ಲಿ - idu kannadadalli
இது தமிழில் - ithu tamizhil
Blogger does not allow copy-paste between languages as far as I can see - the pasted script remains as Malayalam or Hindi or English or Tamil or Kannada or Telugu. The Language Tool on the toolbar does the magic, with Spell-check, too! Nice. Should try out some desktop Indic tools, maybe.
Edit: Tried various tools including Microsoft's Indic support site and Iwrite32. Using the Microsoft IME (Input Method Editor), text can be entered nicely in all apps, but transliteration between scripts is possible only in MS Office or some limited apps. I tried and did not succeed with Notepad, Wordpad, typing in IE or Firefox. Google docs, too can use the MS IME, but no transliteration. The best of the lot seemed to be online tools - wikipedia page on Indic support has lots and lots of good info and links. The online transliterate tool girgit looks interesting.
Edit: corrected a typo in the Tamil.