A friend of mine, Brian Noyle, a Solutions Architect at Idea Integration, has started writing a blog about .NET and GIS development.  He had a recent post that discussed GIS and agile.  The focus of the post was on the assumption that perhaps too much agile lingo is being bandied about the GIS world right now and not enough GIS folks are walking the agile talk they're spouting.  He could have a point...and it may be happening in more than just the GIS world.  Check out Brian's full post and his new blog at http://briannoyle.wordpress.com/.