There are so many incredible resources for us to use. The Loudon County Schools in Virginia have done a great job of compiling and organizing them on their Assistive Technology web page. You really should take a look. Just copy and paste the URL.
There are also many more on the K-12 Tech Tools wiki. You can click on this one.
Free Technology Toolkit for UDL (Universal Design for Learning) in All Classrooms.
Presentation about UDL.
Web 2.0 Cool Tools for Schools
The Next 10 Education Gurus: YouTube and Khan Academy honor effective online educators
A PowerPoint with more than 100 ways to use the iPad in the classroom.