Completely agree about ExtJS. It is quite valuable in that once you learn it there are a lot of things you can easily throw together that would have been a lot

Completely agree about ExtJS. It is quite valuable in that once you learn it there are a lot of things you can easily throw together that would have been a lot more difficult with something else, but the learning curve is so high that its tough getting new developers to the point where they can add to the code base.