Just a little something I whipped up. VERY basic and rough around the edges but you can load your Gmail contacts and see if they show up in the #AshleyMadison data dump.
I do not store any of your info. You authenticate yourself with Google, your contacts are retrieved and stored by your browser, and then your browser calls the haveibeenpwned.com API to search contacts. It's all handled within your browser.
Click the 'Get Gmail Contacts' button to load your Gmail contacts. Once your contacts have been loaded another button will appear and you will be able bulk check your Gmail contacts against the haveibeenpwned.com API.
After your contacts have loaded click the Search'em button to see if any of your contacts show up in the Ashley Madison hack (via https://haveibeenpwned.com/).