HTTP Compression is a well-acknowledged way to improve Web performance and decrease bandwidth usage by compressing text content before transmitting it to the client. This has become an increasingly interesting topic for Web 2.0 sites starting to experience their first growth pains.
The sample above is far from representative. However, I would have thought that companies leading the Web 2.0 revolution would be learning the Web performance lessons of the previous generation.
All data was gathered using the GrabPERF Monitoring System