I just found out the most awesome way to rename multiple files at once.  Select a bunch of files, right-click on the first one in the series, and click on Rename (or press F2).  Rename it something (and put "(1)" at the end of the name if desired) and press enter.  And blammo, Mr. Windows automatically renames the rest of the selected files with the same name but different numbers at the end.  I just used it to rename a bunch of my pictures.  Amazing. #technology