As advised by you, I had submitted the application to the PIO at the RPO, Chennai. Yeaterday, after about 4 weeks of submitting the application, I received the passports by mail.
I believe in a few days it would be 30 days since you filed your RTI Application. I hope you have not withdrawn it. Even though you have received the passport, there would be many like you, who still have not received their passports. They also might not be as brave.
Please make sure that you get the information on the RTI Application you had field with the PIO of the RPO, Chennai. After you get the reply see if you can do something with the information received to make it easier for other folks get their Passports faster.