Internet Exchanges: how they benefit the ISP
http://www.wispa.org/ WISPA is a 501.c6 advocacy organization representing its membership and other companies who are part of the industry ecosystem. The Association promotes the development, advancement, and unification of the wireless Internet service provider industry.
http://gregsowell.com/ Routing, mikrotik, Maker
https://www.mtin.net/blog Blog about xISP topics, networking, wireless, and related topics
http://stubarea51.com/ Tech about ISP, networking, and related topics