I downloaded this the other day from download.com thinking it was going to be crap but at least it does batch image conversion. What I got was by far the best image viewing program I have ever seen , not only an image viewer but also editor,batch converter ..etc etc I deffinatly give it a big rec !! It has tons of neat features and it's really fast and it's FREE
Here is there site
http://www.faststone.org/ they have a few other good programs to like the screencapture program also FREE ...I like there stuff so much I even made a little donation. Anyways enjoy..