The new CSS Shapes specification has the potential to change the way you think about arranging content on a webpage. (Hint: think outside the rectangles!)
Since I publish a screencast series, I'm curious what other programming screencasts people watch. So I asked around. Here's the list, based on feedback as well as my own bookmarks. Railscasts - Ruby on Rails Destroy all Software - Ruby, Python, Unix, software design. Code School - Ruby, Rails, iOS, JavaScript, HTML/CSS, etc.