I have been using Ext 2.0 for some short time now and I have been impressed overall. I do have a couple questions, however, for which I can't seem to find explanations.
First, why the need for Ext.BLANK_IMAGE_URL = '../some/localpath/to/s.gif'? If I don't specify this, the default implementation looks on the web for this image. Why is this image special and treated differently than all others? One tutorial I saw made mention of this only to say you want to make sure you set the local path because of course you wouldn't want to make a call to extjs.com. I agree, of course I wouldn't. I just don't understand the reasoning behind setting things up this way in the first place.
Second, the ext-all.css includes
What was behind the decision to make these styles apply directly to html tags rather than specific ext classes? I was bitten by this one and had to do some additional coding in order to have bulleted lists appear correctly on a page which also included some ext widgets.
I am guessing that there are some good reasons for these things, but I would love to have some background to help me understand.