Cidera (formerly SkyCache) used to provide a service that pushed popular Web content into caches via Satellite broadcast. They also offered Usenet/NNTP feeds with this technology. Cidera was abruptly shut down in September of 2003.
Mirror Image offers a cache peering service, with large caches located at “key Internet traffic points around the globe.”
Akamai offers various content delivery network services.
Speedera offers content delivery network and global DNS-based load balancing services.
Digital Island offers content delivery network and other services.
IRCache operates a number of Web caches throughout the U.S. These are available to anyone to use, or experiment with, at no charge.
Anonymizer offers a proxy service for monthly subscription, with the purpose of anonymizing your Web browsing activities.
ProxyMate is a service from Lucent Technologies that enables internet consumers to protect their privacy while they use the personalization capabilities of web sites.