Datahounds might be interested in the Renesys ISP rankings for 2008.

Renesys is a company that specializes in collecting data about the Internet, focused upon the peering ecosystem. Its rankings are essentially a matter of size — how much IP address space ends up transiting each provider?

Among the interesting data points: Level 3 has overtaken Sprint for the #1 spot, Global Crossing has continued its rapid climb to become #3, Telia Sonera has grown steadily, and, broadly, Asia is a huge source for growth.