free open-source mathematics learning software

let your audience decide on questions in REAL time (while you are presenting); get EVERYONE's voice w/voting boxes - organize lectures or presentations around what people want to hear about.

graph the usage of terms published in books between 1800 and 2000

a dead-simple group blogging tool - possibly useful in developing communities around particular projects

a great visual explanation of why EVERYTHING is going to the cloud

Good balancing act to follow, teach, and propogate

Six phases of web design: very good for instruction and/or internal use

environmental scanning (they call them listening tools) site

International Society for Design and Development in Education Journal for Design and Development in Education

only works on the iPhone and Android platform, but once you start using it you will understand why it is such a great product. Once you import your RSS feeds from Google Reader, and your Twitter and Facebook accounts, My6Sense begins analyzing how your read items and will start to give you personalized relevant results. Rather than go based on what you think you are interested in, My6Sense actually looks at what you click on - they have found that sometimes the two don't exactly match up. In this way they can determine what you are really interested in rather than what you think you are interested in.

TechMeme or "Tech Memorandum" is a website which uses both algorithmic and human based content filtering to give you the top stories. Its blended approach gives readers a great overview of the goings on at any time in the tech world

Geneio is a service that installs on your computer and analyzes your current web history to determine content that interests you. A few minutes after installing, it determines your preferences and generates a homepage which is tailored to your interests. The thing I like about Geneio is that you do not need to spend any time 'training' it. Once you install it, it uses your past web history to determine the types of articles and topics that you are already interested in, and I've found it to be fairly accurate.

Snip.ly is a URL-shortening service that also allows you to include snippets, or summaries, of the article you are linking too.

a web application with an available bookmarklet that will automatically take text, either pasted in or from the referring webpage, and summarize it in as few lines as possible. There is a great article over at their blog about how great summaries disambiguate topics. That means that when a word is mentioned it uses context to determine what the actual sentence is about.

Animation for cell biology

possibly useful for National Center work (e.g. CES NCSeT or other projects)