A few months ago, a project bid had me looking at YouTube's JavaScript API for ways to manage a video library through a custom interface. Most of the videos were over 30 minutes, and I thought it would be great if I could provide some analytics on how users were interacting with the videos.
Clicky is an amazing web analytics service. Its killer feature is the ability see data in real-time, allowing you to watch your visitors as they browse your site.
I love Clicky, and I love their API. Because the analytics data is available immediately, I found myself wishing I could have a constant notification of how many visitors were on my site without having to leave a tab or window open all the time.
I also love Google Chrome. As soon as LastPass made an extension for it, Chrome became my default browser. After reading a little about Chrome extensions and how they were just HTML and JavaScript, I knew what my next project would be... ClickyChrome.