SCHEMA.NET returns soon.
I've received enough expressions of interest to prompt me to bring back SCHEMA.NET. The next few weeks will be spent gathering updated information and putting together the site infrastructure. If there are particular XML or RDF schemas you want to make sure are included, feel free to email me.
History
SCHEMA.NET was part of a family of XML-related sites I started in 1997 and was the first site dedicated to cataloging XML DTDs and Schemas. It was actively maintained until around 2000 when updates slowed down considerably. By 2002, I had pretty much abandoned the site. The next few months will be spent restoring it to its former glory.