Learning Web Standards with Opera
Web Standards have never been easier to learn. Everything you need to know is condensed into short, helpful tutorials that inform and inspire. Opera’s Web Standards Curriculum can help you brush up on things you know and maybe even teach you something you didn’t.
It is completely free to use, accessible, and assumes no previous knowledge. It already has support from many organizations (including Yahoo! and the Web Standards Project) and universities. The first 23 articles are currently available, with about 30 more to be published between now and late September.
Source: Opera Web Standards Curriculum