Good XML Websites

[Rick Jelliffe <ricko@allette.com.au>]

I am making up a list of the best XML websites, where "best" means "this is
a website I go to as part of my daily/weekly routine or because
references/links typically lead me there".

My personal list would be, for non-vendor sites:

 #1 xmlhack.com (opinionated digest of mail lists)
 #2 xml.com (articles, resources)
 #3 Cover's Cover Pages (comprehensive topical collections, with abstracts)
      http://www.xml.com/pub/a/coverpage/newspage.html
 #4 Elliotte's cafe latte (opinion)
      http://www.ibiblio.org/xml/
 #5 citeseer (abstracts and copies of scholarly articles, not much specific
XML)
      http://www.xml.com/pub/a/coverpage/newspage.html

For vendor/product sites:

 #1 W3C (technical specifications)
      http://www.w3.org/
 #2 alphaworks at IBM (toys)

What are other people's top lists?   In particular, I am interested in
websites that are interesting.

Cheers
Rick