The Verizon Foundation sponsors Thinkfinity which contains interactive teaching and learning materials.  Take a look at their site here.
Check out Disney's Planet Challenge here.
Mr. Robb has posted hundreds of math videos which he initially created to help his own students.  Check out his YouTube site here.
This website has put together several how-to tutorials for several Algebra concepts.  Check them out here.
The Kids in Need Foundation is offering grants from $100 - $500 for innovative classroom projects.  The deadline is September 30, 2010!  Click here to learn more.
This site is full of great instructional technology resources  Check it out here
Target is awarding 5,000 grants worth $700 each for class field trips.  Applications are due by September 30, 2010.  Click here to learn more.
I came across another source for free online textbooks.  You can check it out here.
Toshiba is funding projects in grades 6-12 Science classes.  You can learn more about their foundation and apply for grants with Toshiba here
I came across this science competition that is open to students in K-12.  According to the website, "It's a hands-on, minds-on project that inspires students and fuels imagination".  Click here to learn more.