AJAX Tutorials @ DesignPlanet.biz
Although there are a lot of tutorials that have the same basic syntax and characteristics it is educational to look through as much as you can.
Every programmer has their own unique way of writing and documenting (or not) code and sometimes one particular style or structure may strike you differently and open up something that was not apparent before.
With that said, here are a few more tutorials to check out.
Link : DP- AJAX Tutorials