I have installed ifranview a half dozen times over the years and I always uninstall it. Maybe I just don't give it time but I think that is part of why i like imageready, I already know the interface.
Well, the good thing about Irvanview is that it can produce extremely sharp images and reduce the file sizes. This image has been processed with irfanview: http://www.aguntherphotography.com/galleries/south_america/peru/titicaca/taquile_girl.html I batch processed all of my Peru Images in a minute or so. Most other gallies are straight from PS.