Billboarding

Who knows...

Here's one:
http://www.lighthouse3d.com/opengl/billboarding/

I've seen other methods for doing it but this one is really easy. Technically, you could easily just copy/paste the code on the page, but what would you learn from doing that?

-Auron

If you want to billboard sprites, the fastest way is to use the ARB_point_sprite extension. There is an example in the end of the Lens Flare tutorial