Bulk Printing with Print Conductor
There is a free version of Print Conductor, a bulk printing program available for download here. This is a very simple program but it can help you to do some very useful things. It uses a simply drag and drop format. You can select settings for the files you are printing individually or in bulk.
If you right click on a file you can specify the number of times you want a file to print, and even what range of pages in the file should be printed. Different documents can be printed from different trays in a printer.