ProCon.org – “We are an independent, nonpartisan, 501(c)(3) nonprofit public charity. We provide pros and cons on diverse controversial topics with facts and quotations from thousands of experts. Our sites are 100% free and contain no advertising. Our mission: "Promoting critical thinking, education, and informed citizenship by presenting controversial issues in a straightforward, nonpartisan primarily pro-con format."”
US Dept. of State for Youth – great information with some fun activities about the US State Department.
Mad Scientist Party – Plan a party with a mad scientist theme. It gives ideas for invitations, costumes, decorations, cakes, food, drinks, activities, and favors. I think this would be fun to do in the classroom too.
Stykx - “Stykz is the first multi-platform stick figure animation program in the world (as far as we know!), and it is COMPLETELY FREE!”
Pete’s Powerpoint Station - FREE Presentations in PowerPoint format & Free Interactive Activities for Kids
Original image: 'Veere: tools' http://www.flickr.com/photos/19907278@N00/36125185 by: Ard Hesselink