Free Mathematics Powerpoint Presentations for K-12
http://math.pppst.com/
Powerpoint presentations play nicely inside StarOffice Impress and so the resources at this site are good to go. But...they really shine when you realize that the SMART Notebook software will import files stored in Microsoft Powerpoint format. (FILE | IMPORT)
Now, this gets very interesting because you have the interactive environment AND the ability to add your own content and interactions to the files. There's huge potential and an equally as large collection to draw upon at this website.

Now, notice that the website starts with "math". What happens if you get rid of the "math" part and back off to the main site? Guess what? A huge collection of presentations in all subject areas! http://pppst.com/
Talking Cat Animations
http://www.fodey.com/generators/animated/talking_cat.asp
Nothing says quality animations like a talking cat. Looking for something a little off the wall for your blog or your website?
Head on over here and create your own catty animation. Type your sentences and let the website do the rest for you.

the mint - It makes perfectcents
http://themint.org/
This is a perfect spot to send business or mathematics students to do some research about money, saving, and investing. In this economy, the content is particularly important.
The site, created by Northwest Mutual, has good advice for students, parents, and teachers. From solid content to online activities, there's material here of interest for all.

Online Quizzes
http://www.proprofs.com/
Have you ever wanted to create online quizzes easily and have them return immediate results? If so, proprofs.com may be just what you're in search of.
Above and beyond quizzes, there are also a number of additional tools that just might fit the bill.

Ah, but wouldn't it be nice if there was an opportunity to share these nuggets when you or others are done? In fact, there is. Categorized nicely, there are all kinds of resources including some for professional certification through Cisco or ComTIA.
The K-12 education link is here:
http://www.proprofs.com/quiz-school/index.php?category=K-12+Education
Clarkson's Museum Box Creator
http://museumbox.e2bn.org/
The Museum Box Creator is an extremely unique way of presenting topics. Like going to a regular museum, sections can have various artifacts.
In the Museum Box Creator, you can add text, movies, pictures, sounds, etc. to build your own museum box. If you wish, you can share your masterpiece with others or use the results of others in your own classroom.
For a truly different way of presenting information, check it out.

Periodic Table of Videos
http://www.periodicvideos.com/
This website features another unique way of delivering content. The method is so unique that it's bound to stick in anyone's mind when they visit the website.
Each element in the Periodic Table has a corresponding YouTube video which goes into detail about the properties each element. Kudos to the University of Nottingham for coming up with such a unique approach for the science classroom.

They also understand the realities of education. If your access to YouTube is blocked, there is an alternate link to access these amazing videos.