As this spans multiple iOS versions i thought i should update here Google have just released a gmail app update to now include multiple accounts (omg finally!) and a refreshed interface. On first glance/use it looks pretty great. Multiple accounts work quite nicely, notification integration works well, notifications pushed quickly to the phone for all accounts. If you are using banner notifications pressing them takes you straight to the message (as expected). Interface is smooth and quick on my 4s and it's extremely handy having the threading, labels, filters and search facility in one app. Only issue encountered so far are badges. Previously had them turned off. I re-enabled in notification centre after the update but they didn't show. Had to manually close the app from the task bar and re-start. I think this is what i've been waiting for, for what seems like ages now. And just in case you didnt see the other thread, YouTube app now supports the iPad. (App store, search youtube, select iphone apps and download).