Reddit reviews Lean UX: Designing Great Products with Agile Teams

It's definitely a contentious topic! There are many ways to implement it and it really depends on what type of organisation you are. A 20-30 people service agency will need a different kind of agile to a large Enterprise company with hundreds of production members.

If your org is committed to it, it's absolutely worth getting an Agile specialist in to do Agile training with not only the production team, but the managers and stakeholders too. The number one cause for failure (in my experience anyway) is when people with authority break the rules to achieve some goal. This is generally down to a lack of understanding of the purpose and benefits of Agile, so training definitely helps.

For some cheaper, more tangible resources - Lean UX is an essential read from a product perspective. Agile Experience Design is really good too!