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Do you mean turning color images into grayscale? Your best bet is to use the Channel Mixer. If you installed all the channel mixer presets from the install disk, there is a preset called Grayscale Standard.cha which is a great place to start from.
Then some people like to turn the image into LAB mode and use the lightness channel.
You could also use the Hue/Saturation dialog or an adjustment layer and reduce the saturation all the way.
The worst but most obvious method is to use Image > Adjustments > Desaturate.
Actually Welles... i'm not so sure about using the Channel Mixer for this.
I've done a few simple tests and it would appear that the Hue&Sat filter actually produces tonal results that exactly match the original colours. Whereas the Ch. Mixer filter introduces a lot of heavy tones into the image that aren't originally there.
However... for the best results i'd suggest just converting the image to Greyscale. That produces even more exact tones to the original image.
Switching to LAB (and using the Lightness channel) is pretty close too. It creates only slightly lighter tones/levels than both Hue&Sat and Greyscale. But it still looks pretty good.
I guess the end question is... does it matter to you if your grey tones exactly match the original image? If not, any one of these methods will suffice. However i would probably still suggest using the Greyscale conversion method; which by-the-way, look identical to the LAB method results.
First... convert your photo to either Greyscale, or LAB (and use the Lightness channel); as previously mentioned.
Then...
Try adding either a Threshold or Posterize Adjustment layer above your photo. If using the Posterize set it to only 2 colour. The default MOR setting of the Threshold filter (128) may or may not be suitable. Try fooling with the setting to find out.
These are the most obvious choices for B&W results.
You could also convert your photo to Bitmap mode and choose the "50% Threshold" setting, but that's the exact same as just using the Threshold adjustment layer.
If you wish to experiment with stylized B&W results... then checkout some of the filters under the Sketch submenu, within the FILTER menu. Like 'Stamp' for instance.
Hope that helps. :B
well thanx for help keeper , well threshold really does this. But i'm trying to do something like this : It's not grayscale and neither it's threshold so what is it :
Not at my PC right now, but I'm sure if you want B&W, you just change the mode to 1 bit (Bitmap). This is true B&W, not grayscale, as in the image evil posted.
1 bit is two colour B&W. You can't even have antialiased edges, so not really sure when you would want to use this.
B&W 
8D
Linear Mode
