I am always amazed on how Google's approach to software updates is truly revolutionary. For everyone who is familiar to enterprise-grade software, like Microsoft Exchange or similar, it's common that new features are coming once in a few years and requires throughful planning, complex and time-consuming deployment.
With Google Apps it's a very different experience. New features are released every week and you, as an Administrator of the system don't have to do anything to implement them in your domain/s.
The only thing I could wish is to be able (as administrator) to opt-out for certain features. Unfortunately, that's not always a case with new features but in general it's a great example of how cloud can really change the life of IT.