PxT
Someone figure out the function to graph Yoda's head
So this is pretty cool, if you have a sufficiently modern browser (that is to say, not Internet Explorer) you can now type a function into Google and get a 3D graph as the first result.  For example, this flower that Google offers as an example:


But, like any good technology, it's already been turned to the dark side.  Thank you, math nerds!