http://www.curiouslabs.com/products/poser4/html/poser3AdvancedUserGuide.html

Instead of turning off the lights, you might try increasing the Ambient colour values on all of the materials.

Renderosity's Tutorials section

Try DAZ 3D. They made most of the figures in Poser 3, and some of the oldest items in their online store (like the Nude Young Woman) should be completely Poser 3-compatible.
Link to Cheapskate Graphics (EnglishBob's site)

Morphhair 1, by Confusius, in Free Stuff

Planet-3D.com (tutorial by the3dwizard)