Sorry for the slow response. Ive uploaded a script csi_output.py to
the group (http://groups.yahoo.com/group/nmr_sparky/files/) , which
runs within Sparky. It takes all HA, CA, CB and C resonances in the
current project and writes some CSI compatible files.

Look at the top of the script for more info ... you need to set it up
by adding a few lines to your sparky_init.py file.

This script is very alpha, and really quite terrible, but I has
worked ... I only put in the bare minimum of debugging (and
optimisation) effort required to get this working for a single protein
structure project, so it has really only been used once so far :).

So, as is often stated as an acronym, Your Mileage May Vary.

Hope it helps,