Has Agile hit the Pareto wall?

We know how it goes: 80% of the effects comes from 20% of the causes.

It seems to me that the 20% that matter when it comes to agile software development has long been invented and documented.

Everything I've read about Agile recently is just more variation on the same: yet another way to write test cases, yet another way to organize your index cards on the wall, yet another way to run a stand-up meeting...

I'd love to be corrected. Otherwise all these agile feeds will start to disappear from my blog aggregator in order to make place for some fresh content.