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Interesting site that compiles explanations via animation and video. Worth considering as an information source. 

Anything from NASA will be slick. I'm a little disappointed in the videos about proportion. A 2 minute video and the mathematics is washed over in 13 seconds, and on top of that it's all procedural in nature (cross-multiply) with no explanation as to why it works. Other resources look more promising to me, but hope NASA looks into doing a better job of incorporating more conceptual development/understanding/explanation.

In the portal you'll find a dynamic textbook, lesson plans, widgets, interactive Demonstrations, and more built by Wolfram education experts. Absolutely a great resource. Builds in representations, applets, explanations of variable use etc. Great tool.  Since it is in Beta, I am wondering how long it will be free and what their plans are for the future. 

Great explanation of social bookmarking from a GREAT source, National Writing Project. 

Instructional strategies determine the approach a teacher may take to achieve learning objectives. Five categories of instructional strategies and explanation of these five categories can be found within this site.

recently led a Google Docs session at Whittier Christian High School and was asked to provide a quick demo video illustrating the way I used formulas (and in particular the IF formula) to grade a quiz made using a Google Form. Apparently my explanation plays well face-to-face but considerably less well from memory. ;) For this video I cut right to the chase and did my best to explain the IF formula for beginners… while keeping under a 5 minute time limit. I hope it's helpful for you and your colleagues and I hope you'll let me know what you think.

If you want to be more proactive about the use of web 2.0 apps in your work, here is a nice, easy to use explanation on how to embed 'stuff' into your work. Again, easy to read, pretty easy to follow, and useful.

Nice resource for ISNs implementation. I like her powerpoint presentation. Nice, simple explanation. Good resource to go to, to get started. No explicit math connections

Allows quick manipulation of a 3-D brain model with explanation of the different parts. You can look up parts of the brain or functions of the brain. If nothing else, it's interesting for an overview of brain function

I love Diigo, and this is a nice explanation of ways to use it. 

Virtual Nerd is developing a nicely organized site. The videos are primarily symbolic in nature but are thorough, organized, and do a nice job of modeling notes to accompany the explanations. 

I've long used Evernote for my own personal notetaking on the web(although I have recently been migrating to Diigo for my online annotations), this post by Shawn Miller is such a great explanation of the tool that I'm going to move Evernote back into the forefront of my notetaking. I do love the mobile Evernote app on iPhone. It makes it very easy to not only take multiple kinds of notes (audio, text, image) but makes it easy to share those notes. 

Mathematics and Multimedia GeoGebra Step-by-Step Tutorial SeriesThe objective of the GeoGebra Step-by-Step Tutorial Series is not only to teach the readers how to use the software, but also to suggest how to use GeoGebra in teaching and learning mathematics. Most of the tutorials are (or will be) linked to related articles containing explanations and proofs about the mathematics discussed in the tutorials.

Great explanation of Voicethread and some very scaffolded examples of how we can use Voicethread in our classrooms. Lee does a wonderful job of developing a compelling reason for using Voicethread and how to accomplish your goals.

Wink is a Tutorial and Presentation creation software, primarily aimed at creating tutorials on how to use software (like a tutor for MS-Word/Excel etc). Using Wink you can capture screenshots, add explanations boxes, buttons, titles etc and generate a highly effective tutorial for your users.

Simple example of a blog post that has lots of power. This is the kind of blog post that I think we can do at CTL as an on-going piece of our work. It captures the ideas that we generate all the time, applies them to the work we are doing, provides a systemic way of producing new material that we can later turn into finished pieces of work. If we begin now, capturing these kinds of thoughts in a library, we can launch a CTL blog with a catalog of ideas that we can turn into posts. If the authors need some help clarifying/fine tuning that is where the system comes into play. By the way this is a fantastic post about the potential of something that is already in many students hands, but repackaged for use in an educational way. I imagine this as part of any distance network that we create, especially with Africa.

skills to solve equations, explanations of events from a Civil War Battle, aspects of an ecosystem, fill in the blank.