Generating high-quality portable PDF files

ps2pdf -sPAPERSIZE=a4  -dCompatibilityLevel=1.3  \
 -dEmbedAllFonts=true  -dSubsetFonts=true  -dMaxSubsetPct=100  \
 -dAutoFilterColorImages=false  -dColorImageFilter=/FlateEncode  \
 -dAutoFilterGrayImages=false  -dGrayImageFilter=/FlateEncode  \
 -dAutoFilterMonoImages=false  -dMonoImageFilter=/CCITTFaxEncode  \
 document.ps  document.pdf

See: http://www.volkerschatz.com/tex/hiqpdf.html