I get a lot of my information on new gluten free products from www.foodsmatter.com
Their excellent listings page details the arrival time of particular gluten free items in shops and they now include an unbiased review of each item.
Their detailed UK-centric website is also a great source of information on most other 'free from' foods and contains articles on research and recent developments in 'free from'.
In other news - I will be keeping an eagle eye on this website and faithfully testing the foods mentioned (for the sake of the blog obv. It's a hard job but someone has to do it!)