I'd seen the below video by Lee Varis a while back, and now I finally applied it to some of my portraits.
Here are the results and see the video itself after the photos. The "before" shot is on the left.
The thing that's nice about this tutorial is it gets rid of the shiny skin without losing any texture or color tones. It allows for very natural color skin while getting rid of the shiny stuff!
And here's the video. Thanks Lee for making such an easy but incredibly useful tutorial!