TIP | How to make PDF files smaller in Mac OS X...!
Terry Willis
1. In any Mac OS X program, choose File > Print, then choose ColorSync from the bottom-most pop-up menu (which usually reads Copies & Pages to start).2. Next, in the ColorSync section that appears at the bottom, choose Reduce File Size from the Quartz pop-up menu.
3. Finally, simply click Save As PDF. I haven't tested how much smaller it makes files, but it should help somewhat, especially in files with lots of graphics. Sure, Adobe Acrobat still gives you lots more options, but this method is built into the operating system, thus saving you hundreds of dollars(pounds!).
Courtesy of http://www.penmachine.com
Worked for me exporting from Apple PAGES! You can obviously pay for programs that do this, but this is FREE.