Gmail announced improvements made to Gmail for mobile, running in the iPhone and Android web browser only. First, you'll notice that it's a lot faster when performing actions like opening an email, navigating, or searching and if the data network drops out on you, Gmail won't. You'll still be able to open recently read messages and to compose over a flaky, or non-existent, network connection. All this is achieved with aggressive caching and by leveraging new browser technologies, like HTML 5 and Gears.