The Gmail app for the iPhone that was taken down just as quickly as it appeared two weeks ago is back. Phew! Problems with notifications prompted Google to take the app down, but now it says those have been fixed. The app is supposed to look and act a lot like you're used to the web version of Gmail to look and act, which is nice if you're the type of person who sets up folders, applies labels, and applies filters. If you just like to check the old Gmail inbox for new emails, you're probably just as well continuing to use the iPhone's service.