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On May 28th and 29th in San Francisco, join some of Google's engineers and talk about building superb applications with Google Code and other open web technologies. The Google I/O conference will discuss AJAX, JavaScript, tools that leverage Google Maps, social applications, APIs, mobile apps, and more.
You can register for the event here. But better yet, if you're willing to wait, we're holding a ticket giveaway. Just answer the following question in a comment, along with a link (if applicable):
What's the most innovative or interesting thing you've done with a web API?