I've been down the route of buying Mortice ID books and templates off E-Bay and trust me some are marked up incorrectly which could spoil your weekend on a job. I've also built up a good set of photos from locks that I have purchased or managed to source from customers.
The ICL book
http://www.theinstituteofcertifiedlocks ... manual.htm is a very comprehensive book made up of common locks and also hard to come by locks, the pictures are lifelike in that they show worn locks not the shiny ones you practice on the bench with then never see again. It also encompasses the majority of the decoders on the market and other bypass methods.
Like most tools you could make one up yourself however I would rather spend my time picking locks to get my time down rather than wasting valuable time sourcing locks, taking photos, printing them out etc. After all time is money.
Having had the pleasure of drilling off the talon on a Chubb 3g114 and wasting a good hour with a Bailiff and Engineer tapping their feet behind me soon made me concentrate a bit more on lock ID and drill points.