Many modern lighting techniques will be available in the newest versions of Ogre. A GSOC was attempted to add these features, but was never completed- link ( http://www.ogre3d.org/forums/viewtopic.php?f=13&t=63763 ) Check the Ogre 2.0+ forum for the latest news on modern lighting implementations.
Lights in Ogre Tutorial
Per-Pixel lighting shader
http://www.ogre3d.org/tikiwiki/PerPixel+Lighting+II
Ogre::Light class reference
http://www.ogre3d.org/docs/api/1.9/class_ogre_1_1_light.html
Ogre camera, light, shadows tutorial
http://loremar.frihost.org/2011/09/ogre3d-basic-cameras-lights-and-shadows/
Lights explanation