Agile Methodology for SharePoint Consultancy

I've been reading up a bit lately about the Agile Methodology for Software Development. It's iterative approach to solution development seems to me to suit SharePoint down to the ground - deploy the platform and then build solutions on the top.

I know of a few partners that are using Agile for their SharePoint Consultancy - People like Business Agility, dot net solutions and BrightStarr - And I was wondering if anyone else was using this approach?