Google recently pulled access to their Web Accelerator, here’s what they have on the download page:
Thank you for your interest in Google Web Accelerator. We have currently reached our maximum capacity of users and are actively working to increase the number of users we can support.
I’m sure Google can handle the number of users – more likely they pulled the accelerator due to bad PR and web security issues.
Update: Matt Hicks confirms Google’s Web Accelerator is breaking web apps and security.
Update #2: Google’s Web Accelerator allows Chinese citizens to view pages censored by the Chinese government.