> Each of the web sites you list is actually an HTML site
Yes, I am interested in sites with interesting content: nice sites made using XML can be someone else's list.
> What is the URL for citeseer?
That and the acm.org digital library (http://www.acm.org/dl/proc_byseries_list.html) are so great for catching up on research over the last 20 years: they make the web a serious resource for research. Not much XML yet, but many related things.