Easier then all of that,
Acrobat 9, Click on Document>then Reduce Pdf Size> then will prompt to click which version or later to reduce, pick any, doesnt really matter> then pick where you want to save it, and voila. Let it reduce it, takes 1-2 minutes and voila your done !
This retains the quality but removes all the background junk that there is in PDFs. I just did a 13mb file down to 800kb file, works great !