Sieben Design

CHMOD interactive tutorial
Dave Eisenberg’s most excellent contribution to the online community of learning! This is a super great tutorial for anyone who wants to learn (or has forgotten and needs to relearn) the ways of the chmod command. Good stuff don't leave your files at 777.

Dynamic Content with DOM2
This is a great article to get started with DOM2 ( aka: Document Object Model Level 2). It explains why the 'document.write()' property is bad and should be avoided. It takes the concepts behind the technology and breaks them down into understandable chunks. THis article does pre-suppose a basic understanding of the document object model and parent/child node relationships. There is also second part to this article!

Ubuntu Wiki (Dapper Specific)
This is a really great reference for any Ubuntu user- from beginner to advanced. It provides extensive documention that is easily searchable. What I like best about this site is that there is nothing extra - just the commands that you need to do what you want. This Wiki is just for Dapper.