I learnt HTML/CSS a good few years back, then PHP a little later. I\'ve recently become interesting in web development again, just started playing with frameworks like Djang
This is one of the best videos for beginner javascript developers that understand how to program in other languages:
It's a talk the John Resig did last year at Northeastern, most of it is devoted to talking about core javascript, then the last quarter of the talk jumps into jQuery:
http://video.google.com/videoplay?docid=-7485992465859932389&ei=jhZUSu73OpfSrQLgyYV3&q=john+resig&hl=en
It's actually a really interesting tech talk and presentation since he does live examples and Resig is pretty good at presenting.
Like others in this question, I also highly recommend reading Javascript: The Good Parts for a better understanding.