I'm a fan of xp methodology, and I am studying and using it a little at a time.
 
One of the questions I do to myself in these days is:

• What is the difference between SCRUM and XP?

I have found some answers in Martin's article:
http://martinfowler.com/articles/newMethodology.html

How Martin wrote the big difference are:

• Scrum concentrates on the management aspects of software development
• Scrum dividing development into thirty day iterations (called
  'sprints') and applying closer monitoring and control with daily scrum
  meetings
• Scrum places much less emphasis on engineering practices
  

I still prefer XP because I like the TDD approach.
What do you think about?