Recently there were changes made in the PPF interest rates , NSC rates and duration and post office deposits . Now the notification date which will be applicable for these changes has come and its 1-12-2011. So the new PPF rate of 8.6%, limit of 1 lac , NSC tenure of 5 yrs , revised interest rate, discontinuance of KVP (Kisan Vikas Patra) and revised interest rates for Post office fixed deposits will be applicable from 1st Dec 2011 .
So in this year itself , investors can put upto 1 lac in PPF which will be a good news for a lot of investors. (Source)