This program (some parts of which are free) allows you to customize the math standards based activities you can assign kids. It will quiz them and assign intervention modules if needed by topic. You can track all of the kids all of the time.
My preferred means of collecting and sharing links.
Fully integrates with Delicious -- which had been at the top of my list until their new stacking system which I find . . . well . . . gross.
LOADS of other functionality around groups, discussions, annotations, note taking, sharing -- really well designed and gentle learning curve.
A free student response system through laptops and mobile devices that allows you collect different types of responses with a simple weblink. Display results
An amazing yet simple site for group project management. Share the responsibilities, categorize and make notes, to do's and vote on good ideas. Organize and assign tasks including uploading documents and linking to videos.
A great and simple way to start developing an online portfolio with this free tool. Add youtube and vimeo vids, upload files, Google Docs, Blogger and more. Even guides you through with questions. Share or keep private.