For those of you into this sort of thing, Oloneo software have a rather fancy bit of software available for beta testing - which, of course, means it's free.
PhotoEnginge is primarily for HDR work, which it does in "real-time" and at full resolution but you can do some interesting other things as well. I particularly like the "re-light" feature which could be a real bonus for any interior photographers. You shoot the same scene (say the inside of a room) with one light on, then switch that light off and turn on the next light and re-shoot. In an HDR-like way you can then merge the images and turn each light on and off in the software... A demo is on
youtube
You can download the beta version of the program (and get more information)
here