CDN

aka Content Delivery Network

http://en.wikipedia.org/wiki/Content_Delivery_Network

Akamai is the big name.

• Aug'2007: Om Malik on price wars

there are P2P players

• http://gigaom.com/2007/10/30/grid-networks/

  • Akamai is adding P2P capabilities

Amazon S3 is essentially in this space.