Although we've all heard for years that Google does index SWFs in some mysterious way, no one has really understood exactly what that meant. All we knew was that it was pretty much useless. But, if my sources are correct, things may be changing.
The beauty of FIVe3D (other than its size, ease of use, and a few other things) is how easily extendable it is. For a previous experiment, I needed a way to draw an arc in 3D space. This isn't something that FIVe3D provides, and in fact it was a little challenging to find the math I needed. However! Once I found it, I was able to easily use FIVe3D's drawing API to put it into action.