TeacherLink: links to excellent educational applications online (Mostly Flash).

HyperStudio: Roger Wagner's HyperStudio is all about media fusion -- easy-to-learn class-project, website, presentation, game, tutorial design, to name a few. It also allows video editing and integration with a host of other applications such as Google Earth.

EdFoc.us: Follow Willy Kjellstrom's activities, focused on digital fabrication and children's engineering

Learning Technologies Group at UIC, my alma mater

Punya Mishra's Videos

Flash and Math - lots of great source code for mathematical applications of Flash

MIT scratch - great programming tool, aimed at middle schoolers and above