Scratch, an excellent and free drag-and-drop programming language for kids developed at MIT, has a new web-based interface. My 10-year-old daughter Jane uses it to create puzzles, games, and interactive cartoons. One thing I like about Scratch is that it's really hard to make a syntax or spelling mistake. The inevitable bugs that arise in a complex Scratch program are therefore more interesting to solve.
Last year I reviewed a terrific introductory book called Super Scratch Programming Adventure!, which teaches Scratch through game programming. There's a new version of the book that covers the web-based Scratch 2, and it went on sale this week.