Most readers here are chip, optics, or hardware focused but a few care about carriers. Here’s a couple of new blogs on Carriers that are worth reading if you’re interested.
CEO of Zayo – a wholesale carrier. http://www.bearonbusiness.com/
Good detail on the major carriers – http://ikeelliott.typepad.com/telecosm/
New one on Level3 that looks good. http://www.itaoran.com/