The drift project has begun! I was looking to start writing up a definitive guide to drift, but with the little research that I'd done so far it became apparent that it wasn't going to be that easy as explaining it requires a degree of understanding of Physics well beyond my very rudimentary knowledge. So I've requested the help of my knowledgable friends on www.bigcricket.com I've instigated a thread where over the next few months or so we're going to try and put together some answers regarding what drift is and how we get it and improve it in our bowling. The forum and discussion is here http://www.bigcricket.com/community/threads/drift.62786/#post-415401
and as the info is collated I'll try and form it into a blog. If you know about drift and can add to the discussion - sign up to big cricket and get involved.
Some conclusion have been drawn on this subject and you'll find the results here - http://mpafirsteleven.blogspot.com/2011/11/leg-spin-bowling-drift.html