I don't know if you ever need this, but I regularly use Jalbum to upload files (actually Jalbum itself) to several locations at the same time. To do this hold down the ALT key and click the publish button. A new publish window will then open every time and you can have a unique upload process in each window.
I should add that you don't have to only update the contents of Jalbum's output directory. Jalbum also allows you to upload arbitrary files and folders that you drag and drop onto the folder tree of the Publish window.