There are a few merchants who provide both P4/PP and P5/P6 materials files in their products. Although I use P6 exclusively I appreciate these merchants because P5/6 procedurals don't export to other programs well if at all, whereas image-map textured items do. I'd love to see more dynamic cloth too, but I wonder if people are aware of how much there already is? PhilC's site, PoserPros, RMP and DAZ all have great dynamic cloth items. Much of PhilC's is free.