There's a good article about o:XML in the online technology magazine ZDNet. It's called 'Programming for the 21st century--o:XML' and gives an introduction to o:XML and an overview of some of the benefits of the language.
The author of the article, Jeff Davies, writes:
"I see the move to an XML Programming Language as a precursor to a new generation of cheaper, high-quality, bloat-free software."
You can find the article online here, or get it in print version.