enfuse is a program used to merge different exposures of the same scene to produce an image that looks very much like a tonemapped image (without the halos) but requires no creation of an HDR image. Therefore it is much simpler to use and allows the creation of very large multiple exposure panoramas.
enfuse is based on a paper by Tom Mertens, Jan Kautz and Frank Van Reeth. http://research.edm.uhasselt.be/~tmertens/exposure_fusion/
enfuse is currently in beta and available with the development version of enblend.
Announcement on Panotools-NG: http://www.nabble.com/A-christmas-present-td14438390.html