Content from the Nintex Product Blog has all been migrated to the Nintex blog.
You can filter by content with links on the right side of that blog, seeing see only Nintex Product Blog content by clicking "product."
If you have questions, you can leave them in the comments on that blog. Or direct them to the Sr Dir of Partner and Enablement Programs at Nintex, Alistair Cloke. Alistair.Cloke@nintex.com