I think Chinese Learn Online is definitely one of the better programs out there. It is a gradual course which takes the learner from total beginner with no previous knowledge, and builds up from there. I used several of the podcasts for a Conversational Chinese course that I taught at our local junior college, and the response from the students was very positive. The methodology is very sound, and the real advantage is that students are not overwhelmed in the beginning, nor are they permanently stuck in a lower level.

What you are doing right and the others aren't is two fold.

First of all, you have a progressive series. A person can actually start from the beginning and work their way up to a conversational level. All the words are accounted for. You remind people of what is new and what has been covered already. You remind them in Chinese and use English sparingly.

This is the way that it should be done. After the initial stages, a language should be taught in the target language as much as possible.

The second thing – Lessons are introduced in Chinese.