ExtJS is improving but will have some serious trouble in adaptation as it grows. First one is the license. Documentation is not as good as I expected. A dojo book like doc would help lot of web developers to learn and master ExtJS. Charting engines are missing. It's very important for any serious application to have some charting capability (Because the managers need it :-). I have heard that open flash can be combined with ExtJS but where are the tutorials. Are there any or am I not searching properly?