It looks like you can put any any fears of the short-lived Gmail iOS app going the way of the BlackBerry app to rest. Google has just announced that the app has returned to Apple's App Store, and it promises that the problematic bugs that plagued the original release have been fixed. The company also says that it has "received a lot of helpful feedback and feature requests" during the app's two-week absence, and further notes that it's "just getting started" with the iOS app and plans to rapidly add a number of new features including support for multiple accounts and improved notifications.

http://www.engadget.com/2011/11/16/gmail-app-for-ios/