Ahhh, after a little more digging, tuns out there is a filter built into Gimp that does the job. Under distort-->newsprint
also: Also in Photoshop, if you convert an image to Bitmap mode, it'll give you options to apply halftones to it.
I have Gimp, but no PS. Gimp is ok, not as nice to use as Paint.net.
Sorry for the odd formatting, cutting and pasting does that sometime.
Cheers