Building an Agile Team

I have read this article with interest regarding building an Agile Team
Very good points, summarizing everything in two words: building an Agile Team, its all about communication and resources... good resources!
But from experience I would like to add the following point:
What about one tries to build an Agile team with the existing resources?
This is the common scenario were one tries to introduce Agile in an existing technical department.

I think Agile\Scrum is all about common sense. Definitely as stated in the article, communication is what makes the success of an Agile team but also the continuous improvement, sprint after sprint.
And I think that's what makes sprint retrospectives very important. From experience, sprint retrospectives are not given the necessary attention. Sometimes, retrospectives are done for the sake of doing them.

A retrospective should be a 'mini-revolution'.
Pigs should openly speak of what is hindering their velocity and how can improve it like:

• Software used for the Agile process
• External forces interfering the team
• Lacking of particular resources
• Problems with the current architecture, framework used...and so on.