There are multiple techniques for converting color images into B&W.
Some are simple and give OK results. For the ultimate in control,
you want to split off the channels from your image and use them
selectively to make your B&W image. My revised and expanded
tutorial, "Split Your Channels for Improved B&W," shows you how.

<http://www.thelightsright.com/DigitalDarkroom/Tutorials.htm#SplitChannelsTutorial>

My new PS Action Set for split channels makes it easy to implement
the technique.

<http://www.thelightsright.com/DigitalDarkroom/PhotoshopTools.htm#TLRSplitChannels>

Enjoy!

Mitch