I use this plug in and would not be without it and now with Lightroom support it just got better, because it some much easier to use.
From Nik Software. As noted last month, each of our plug-ins is being updated to support Adobe® Lightroom™ 2. Color Efex Pro™ 3.0 Complete Edition for Lightroom is our latest. If you already own Color Efex Pro, it’s a FREE update.
Here’s a link to how to use these plugins.