Making Shadows Blurry

Can someone please recommend a good way (tut?) on how to get shadows to be a little blurrier? Some of the shadows I’m getting have such a hard edge to them they dont look natural.

Thank you!

Dawg

http://wiki.blender.org/index.php/Doc:2.5/Manual/Lighting/Shadows/Raytraced_Properties
http://wiki.blender.org/index.php/Doc:2.5/Manual/Lighting/Lamps/Spot/Buffered_Shadows