Chronoscope is a work-in-progress time series visualization tool that lets you explore data similar to that of Google Finance. It's written in Java, unlike Finance, which uses Flash/Javascript, and uses the Google Web Toolkit as the hook. After a quick look-see, it's certainly still in alpha, and I'm not quite sure when beta will be available to the public. The browsing is pretty nifty though. I wonder how hard it'd be to do it Flash?