As of 6th March 2014 all previous Planning Guidance and certain Circulars have been or are in the process of being cancelled and consolidated in an online resource - the National Planning Policy Guidance!
We waved bye-bye to PPGs and PPSs but a lot of technical guidance remained 'material'. Now we have an online document of around 800 pages with signing up facility for update alerts. So be on your toes - even good old Circular 11/95 has gone but Annex A - model conditions has been retained.
I won't say watch this space but I am still going through the NPPG online version.