Back to the nuts and bolts of the new Google Voice web app though — it shows the coming promise of HTML5 I’ve been waiting for. Using the AppCache feature means that users can still interact with the app, even without a web connection. Local database storage for web apps is going to play a big part in HTML5 apps — it has the potential to negate the “but you need a connection” argument that has plagued web-based apps for years. With that limitation all but gone, one has to wonder if anyone can block Google Voice from millions of iPhones now? I doubt it. And more importantly, will developers embrace HTML5 as an alternative to application stores that take a cut of their efforts? Looks like phase two of the app wars is just getting started.