I have been looking into training recently as well. It really depends on what you plan to do with the training and how involved you want the process to be. After looking into it, the most highly regarded and internationally recognized programs are AMI training. They do not reccomend distance learning. AMS training is also considered quite good, but may not be recognized in as many schools as AMI would be. There are a variety of other training programs out there, some good, some not so good. The problem is that the name Montessori is in the public domain, so anyone can use it. You should talk with graduates of the program you are looking at and see if they are happy with their training, what the job opportunities are like, etc. You might want to see if they are accredited with a trustworthy association as well. HTH!