A tutorial for those that struggle with making hair models. I find it is really useful. Check out where i used it:
http://www.zbrushcentral.com/zbc/showthread.php?t=28542
Excellent method!!
I think you can draw alpha on sphere or a model of head with diirect brush and discard the white area. That way you can create some bald gaps. Thanks for sharing with us. 
nice one mattbyng- this seems like it belongs in this thread
http://www.zbrushcentral.com/zbc/showthread.php?t=28105
Thanks for the comments 