Mrs. W's Math-Connection is her blog, and you NEED to follow it if you also teach math. She posts lots of photos from her classroom, which means you can actually see her ideas in action.
My favorite picture is this one, and I can imagine kiddos in every grade from 3rd up loving to be points on the plane:
I also really like Mrs. W's post about the Pythagorean Theorem (close to my heart as a former Physics teacher) which includes pics of her kids doing an activity, along with a video and cartoons.
Thanks to Katie's colleagues who convinced her to start her blog. Go visit it to see what else you can use with your students!