What you need to know to be a Web developer

I found this post on d'bug very interesting. It covers many of the things that a Web developer might do or know including:

• Information architecture
• Web design
• Client-side programming
• Server-side programming

I think he's missing at least one thing: writing or content development. And if you wanted to be really technical, you could include the IT side of things - including server management and other back-end administration like CMS.