For years I enjoyed a Gmail, Google Calendar Sync (wirelessly), GTalk, Picasaweb and many more applications for my old Blackberry. These were not some formatted website, but real stand-alone applications. Not a single one of those apps have been released yet for the iPhone from Google.
I really thought Google would be all over the App Store by now. Sure Google has some iPhone formatted websites, but that is not the same thing. A web version of an IM client is essentially useless. It needs to be able to run by itself and notify you when you have received a new message. It is not like Google has to start from scratch. They have tons of programming experience, already have released a Google Maps, and the applications are already available for the Blackberry. Besides, you think they would jump at the chance to get a head start on the mobile advertising business.
Part of the reason might be that Google is waiting for Apples "notification system" to go live, but that would only be used by some of their applications.
Google, where are the Apps?