Jason Fried of 37Signals writes about some of the potential problems that Google Web Accelerator can cause in your web applications, due to the use of Prefetching within the product.

The accelerator scours a page and prefetches the content behind each link.

Mozilla browsers support a feature called link prefetching, which allows a web page to tell the browser to prefetch a url if it is idle. Google has been using this technique in their search results, telling Mozilla to start loading the first result. I also noticed that MXNA 2.