Apparently you should think very hard before using Google WebAccelerator. Besides the privacy angle, it appears caching can be a bad thing. O'Reilly Radar has a post about how Google is actually causing webapps to delete things without being specified by the user. WebAccelerator is following all links on pages prefetching things. However many poorly written web apps have links that are GET requests instead of POSTS to perform application functions. The difference is that unlike a webcrawler which is walled off from restricted admin pages WebAccelerator is in essence logged in if your application isn't HTTPS (which it ignores). Thus it has access to sensitive urls. More food for though for AJAX developers out there.
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