Try pprune.com....there is a wealth of gouge info on that site. When I interviewed in April and Sept 05' the info seemed to be right on. Also "Handling the Big Jets" by D.P. Davies is the book that they recommend studying from.
Winglet vs. non-winglet, IAS/MACH/TAS relationships, hurricanes/typhoons - what are they/where do they form, windshear - knowledge about the it/escape recoveries from it. Stuff like that seem to be popular tech questions.
FO