As of this writing, the link has been temporarily restored, but you can expect that this will make waves again. It can be quite difficult for a carrier to maintain the traffic levels needed for peering, especially with a large ISP like Sprint.
03 November 2008
Sprint and Cogent
If you have followed the news, you may have come across this item last Friday. A more detailed technical description is here. The world of interconnection in the Internet is cloaked in non-disclosure agreements (NDAs), so when a story like this breaks, it is useful to look at it in more detail. Not surprisingly, both Sprint and Cogent were pointing fingers (see Sprint's version here, and Cogent's here).