I just finished reading a new book, Drupal 6 JavaScript and jQuery, by Matt Butcher. The book title makes it sound highly specialized, but in fact it's a great resource for a variety of readers, from Drupal beginners to JavaScript experts. Best of all, the book brings together two of my favorite open source technologies: Drupal and jQuery. If you aren't already a fan, I've written elsewhere about Drupal's benefits, and for jQuery, one statement should win you over: query HTML content using plain old CSS selectors!
Matt does a great job leading the reader from very basic principles to advanced concepts, thoroughly enough to initiate less experienced coders, but quickly enough to get everyone to real meat right away. You will get immediate value from this book whether you are a web designer just starting out with Drupal and/or JavaScript, an intermediate coder looking to expand your skills with either Drupal or JavaScript, or an advanced Drupalista or JavaScriptor looking to bring the two together.
A couple of days ago, Mozilla Labs released an alpha version of Ubiquity, a Firefox extension that puts crowd-sourced, powerful, mashup commands a keystroke away in your browser. My first thought was that it was like the Mac OS utility application, Quicksilver, but for the entire web rather than just the local operating system, an idea clearly shared by others.