Below you’ll find how-to documents on various technical topics:
Serving XHTML with Apache: instructions on how to configure the Apache HTTP Server to serve XHTML documents correctly and how to deal with bad browers.
Reusing OpenSSH connections for much faster connecting: instructions on how to configure OpenSSH to reuse existing connections, when possible, and workarounds for problems that may occur.
This site is valid XHTML+RDFa, CSS.