Blender and Zbrush can communicate using the GoB add-on. Pierrick Picaut has written an in-depth tutorial on how to use it.
I got some nice try with Zbrush lately and I was able to make a cool illustration for my newphew before christmas (in 3 days currently). Thanks to Zbrush and the GoB addon, I was able to drasticaly increase modeling speed and reach the deadline :). It's called Carlo's Friend - you can see it here.
I'm super happy I got featured on BlenderNation with this one.
Some people asked about the process so I've tried to gather myself and write something that could help a lot of people I hope. It's pretty basic but doesn't cover basic use of blender nor Zbrush so it might be aimed at average Blender users.
It's not a bible, but the few things I've understood really open blender possibilities.
Hope you'll like it.
Wish you all super new year and see you soon with new video tutorial.