I found a command line method to reduce PDF file size, but it gives me an error. This is from "terminal":

frank2@frank2 ~/DTP Projects/AMC Files/AMC 23 Summer 12 $ gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=AMC_23x.pdf AMC_23.pdf
Error: /undefinedfilename in (AMC_23.pdf)
Operand stack:

Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push
Dictionary stack:
--dict:1161/1684(ro)(G)-- --dict:0/20(G)-- --dict:77/200(L)--
Current allocation mode is local
Last OS error: 2
GPL Ghostscript 9.04: Unrecoverable error, exit code 1
frank2@frank2 ~/DTP Projects/AMC Files/AMC 23 Summer 12 $

So it seems I have an "undefined file name" in the PDF that PgS created. All graphics are embedded. Any ideas? Using a Ghostscript "print to file" program on my Windows machine produces a 5-6 MB PDF file. This similar file made in PgS comes out to 16MB! None of my graphics are large, all are 120 dpi or less. Any ideas??