Apparently we're on the same boat here. I applied for my ILR (married to a British) October 2009, did the biometric enrolment on December 3rd 2009, and I still haven't heard anything from them (I had a flight booked on the 17th January 2010, had to delay it obviously), but I did try to call the UKBA and they said it usually takes 4-6 weeks after the biometric. So when was your wife's?
I have a friend here who applied for the ILR (she also got married to a British here in the UK) on September 2009 (she said it was the last week of Sept) and she got her documents back just a few days before Christmas and her ID card about 10 days after that.