EleMath is a wiki devoted to providing math resources to elementary school teachers. Check out the sidebar where you will find plenty of information to help inform your teaching of math. There are links to sites that feature virtual manipulatives that would be helpful if you have a computer station in your class or a SmartBoard for whole class demonstration. If you work in one of the 48 states that have adopted the Common Core State Standards, you should click on this link for resources to help you prepare for this transition.
Thanks to Drew Polly of UNCC for creating this wiki and for the work he is doing to help math teachers in North Carolina.
If you like the image above, check out the Math Images Project at the Math Forum. This particular image is a hyperbolic tiling created by Jos Leys at Mathematical Imagery.