I'm working on updating the comprehensive guide to canned clam chowder, which was first published in June 2011. There have been a few minor updates over the past couple of years, but since I first posted it, Campbell's has discontinued some of their products and introduced others, and there has been at least one major recipe and/or label change. Look for a heavily revised guide to come out soon.
In the meantime, if there are any canned (or plastic-pouched) New England-style clam chowders you think I should try, let me know about it in the comments here or through the Contact Me form and I'll do my best to find them. Remember that I have to have some way to get them (online ordering or from a store close to the Western Massachusetts / Northern Connecticut area.) Also please remember that I do not accept manufacturer's samples or freebies.