I don’t know about anybody else, but I have been looking in to using Sunflow with Blender and I am extremely impressed with it.
Anyhow, here’s a tutorial for Sunflow on using image based light that includes how to export an ibl from Blender that I thought some people here might be interested in. It was written by etr9j, my apologies if he’s already posted it elsewhere on the forum and I missed it.
Nah dude its awesome!@ Been tring to get back into Sunflow after the new release. Tahnk You 
The Blender exporter to Sunflow has been worked on quite intensively these late days:
http://sunflow.sourceforge.net/phpbb2/viewtopic.php?t=14&start=45
IBL is more straightforwardly dealed with since a few versions. Try the last unofficial one:
http://www.geneome.net/blender/blenderfiles/scripts/sunflow_export_merged_16.py
There’s a bug, though, in the Camera panel. In the code of the script, change:
def drawCamera():
global DOF, DOFRADIUS, DOFDIST, SPHERICALCAMERA, FISHEYECAMERA, LENSSIDES, LENSROTATION
to
def drawCamera():
global DOF, DOFRADIUS, DOFDIST, SPHERICALCAMERA, FISHEYECAMERA, LENSSIDES, LENSROTATION, BACKGROUND
Should be updated soon.