Now Google support most of common languages in your area, if you are where ever in this world.If you are an Indian.It support all major languages like Malayalam,hindi,tamil,marathi,punjabi.That means it help you to write in Malayalam more easily and post it in blog. ..
First of all you should make it ON.
For this ,Follow this Step.
Go to Dashboard ,Select settings (Basic).
Now enable "Enable Transliteration ? "
It had seen most of the fonts are not supported by blogs.So it is better to use Google transliteration.Here you can write any language with most easily.i sure it will help you very much.
Visit here to write in any language http://www.google.com/transliterate/indic