A couple of my (best) ear training articles are located in my Learning to Improvise series under the IMPROVISATION section of this jazz blog:

Learning To Improvise - Introduction: This article discusses my jazz education and the odd absence of adequate ear training.

Learning To Improvise - Ear Training: This is my main article on ear training and its importance in jazz improvisation. If you're going to read anything I write that discusses ear training, this is the article to read!

I also discuss my progress with ear training in my various "anniversary" articles.

And last but not least, you'll find a lot more ear training accompanying each of my free ear training tools.