I just discovered the Math Munch blog. It promotes itself as "A Weekly Digest of the Mathematical Internet." Their blog further explains:
Here you will find links to lots of cool mathy things on the internet. We'll post some new items each week for you to enjoy. We hope you are as inspired and excited by these creations as we are!
This is a really terrific blog that's been publishing for just a bit over a year. It's chock full of images, graphics, and videos. Justin, Paul, and Anna, the "Math Munch Team" are doing a terrific job so I want to give them a plug.