Great job on this free utility! It did exactly what I needed it to do; now that Mac OS X 10.5 has this functionality, I will not have to use it, but I was stuck on a 10.4-powered laptop and really needed to combine some pages.
Only two things I could suggest: page numbering, as mentioned by another reviewer, would be sweet, as would the ability for the program to detect where in the list I am dragging and dropping the files. It automatically puts newly dropped files at the end of the list, but it would be nice if it let me insert it between two pages already in the list.
Great job, I owe the developer a mighty large beer.