In my book, having worked agile before I even knew there was an Agile Manifesto, being effective is all about simplicity, not about complex processes or tedious administration.
By now, many shops have blasted to much air in their agile processes that we are back with balloons big enough to hide the reinstated waterfall project management.
So it is great that that Jon Kern is back trying to really explain what Agile is about in this interview: [Wayback/Archive] Agile Manifesto co-author on making process ‘beacon of hope’ • The Register
Just one quote (as you should read the full interview):
The Wiert Corner - irregular stream of stuff 