Also check out gphoto2 at http://www.gphoto.org/gphoto2
I am using this with a Nikon 990 under FreeBSD 4.2+kame with USB on a
TP600E.  The 'libusb' library gphoto2 uses has a broken 'freebsd.c'
file; I've patched it to work.  As FreeBSD's USB support is taken from
NetBSD, I'd expect it to be pretty easy to make this work on NetBSD.
(I've sent my patches in, but they aren't in libusb cvs yet.)

        Greg Troxel <gdt@ir.bbn.com>