I think that there are times when HTML5 apps wrapped in UIWebViews make a lot of sense. To me, I would rather spend a small amount of time getting a HTML5 app

I think that there are times when HTML5 apps wrapped in UIWebViews make a lot of sense. To me, I would rather spend a small amount of time getting a HTML5 app out on BOTH iOS and Android to test an idea or concept. If the app on either platform looks like it has some traction, then I'll take the time to write a native app for that platform. This line of thought definitely does not apply to this Gmail app. I also wouldn't recommend it for anything remotely resource intensive, but the vast majority of apps are not. The new version of Sencha Touch (version 2) is very well done. It has a steep learning curve, but I think its worth it to be able to quickly throw together an app that works on both iOS and Android to test a product idea.