Hey v_sys,
I am in a similar situation too. My sponsorship was approved on November 14, 2012, and CIC said my wife's immigration file was sent to NDVO. I haven't received a passport request, or any communication at all either in the 5 months since then. I got my MP to enquire on my behalf, and they got a reply back on March 8, 2013 saying:
This application was received at our office on 07Dec12 and is currently awaiting initial review, following which we will contact the applicant directly to advise of any additional information or action required.
So, they had not even touched the file in New Delhi by that point. It's been another month since then and still no PPR. I made a case specific enquiry over 2 weeks ago, but no response. I applied for GCMS file yesterday. I figured this way at least I will have some information on what's going on with the file. I suggest you do the same asap - it's a very easy procedure, and they are obligated to get back to you.
A question for others...
I applied through an agency, and it's their contact information (email) that's on the application. So as soon as they get it, they would let me know. The contact phone number is also the agency's number in Canada, but as an alternate, I had given my wife's phone number in India. How likely is it that they might have called my wife directly at that number, instead of sending an email? Because that's the one possibility I'm now thinking that we could have missed a PPR from NDVO.
I guess for now, I can only wait for the GCMS file to come back...