Testimonials for XHTML 1.0.
The World Wide Web Consortium's official press release for XHTML 1.0.
Article by Peter-Paul Koch: "XHTML isn't about the present, it's about the future."
An article explaining XHTML in relation to XML and HTML.
Article from Dev.x WebBuilder, outlining XHTML.
Discussion into the three DTDs of XHTML.
Article about the need for XHTML and the differences from HTML.