Free 30-day trials of most Adobe software, including Photoshop, Dreamweaver, and Illustrator.  Great to try a piece of software before commiting to buying it, and great if you're working on a project and don't need more than 30 days to complete it.

Safari Tech Books Online (PennKey required for access) offers several books on web design topics such as HTML, CSS, Javascript, as well as at least one Dreamweaver-specific book, "Dreamweaver CS3 The Missing Manual"