Whats so cool about the render to texture then?
Think about in game mirrors (wall, car), cameras (video, security, hud)... basically anything you can do by rendering the camera view to a texture instead of "big screen" (backbuffer). Not to mention 2D/3D post-effects like bloom and motion blur etc...
"Uses of Rendering to Texture Surfaces":
http://www.gamasutra.com/features/19991112/pallister_03.htm
[not sure if above link requires registering - which is free anyway]
Mustang. Wee. Knickers.
'Nuff said. :o)
Yup, this is getting embarrassing... ;P