Curriki.org is a useful, ever evolving collection of resources for all ages and levels. I like that it has been vetted and organized so that things are easy to find and resources are generally high quality, up-to-date and relevant. The layout can get a bit busy but it is definitely a place I've bookmarked and will return to in the future.
Educreations allows you to view, share and create lessons. The tool is easy to use. I would like to create projects for my students where they create lessons for each other. What a great way to demonstrate learning. There are a few technical details that are a bit annoying - on the iPad you can't preview, delete or your recording. You cannot export your lesson to YouTube but you can embed it into your website.
Michael Stevens' VSauce YouTube Channel I discovered these videos through ed.ted.com. I love how Michael Stevens values questions - even the zaniest - and legitimizes them by seeking answers. Such an wonderful way to inspire and celebrate curiosity and encourage more wonder.
Verena Roberts shared Mozilla's Webmaker Projects. Wow! This is creative project-based learning. Each project has a creative and practical outcome like writing a beautiful proposal, helping an alien fit in with humans, finishing graffiti tags, designing a portfolio, mashing up, remixing...and so on. While working on the course, students are also learning webmaker tools like Popcorn Maker, Thimble and X-Ray Goggles. One thing I'd love to see are examples of projects made by people using Mozilla's Webmaker Projects.
Image courtesy of pdinnen @CC Flickr