Here are a couple of good sites to learn about all the different ways to convert to B&W. I would like to learn the Channel Mixer method. This gives by far the best results.
I really like this article on the Channel Mixer. I wish Photoshop Elements had Channel Mixer.
Here's another one, if you're a little more familiar with editing programs.
Eiderdowns That's My Buddy
CDX, RE, WC, CGC, TDInc.