Hi Casey,
These are proxy apps - they simply take incoming requests and make them on the browser's behalf. Your site has not been 'hacked' in any fashion; Google is simply indexing pages fetched through these proxies.
-Nick Johnson
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Nick Johnson, Developer Programs Engineer, App Engine
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: 368047
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: 368047