Chrome, Firefox, Safari: Add to Wunderlist is a browser extension that submits web pages as tasks to any list in Wunderlist. You can save Amazon items to a wish list, Gmail messages to a specific project and more.
Add to Wunderlist places a little button of the same name on any supported page, allowing you to create a task directly from the browser with the URL attached. While it doesn't work with every page (we're not sure why, as clicking the icon in the toolbar ought to have the same function), the extension currently supports Amazon, Asos, Ebay, Etsy, Hacker News, Twitter, Wikipedia, YouTube, Gmail, Yahoo! Mail and Outlook.
This is a good start, but hopefully we'll see more integrations in the coming weeks as Wunderlist provides an SDK for easy integration.