Unless you use Windows or an older version of OS X, and have an older version of Acrobat Pro that installed the PDF printer (see InDesignSecrets » Blog Archive » Acrobat’s Adobe PDF Printer Replaced in Snow Leopard ) you don't have a print to PDF option available. You'll have to print to Postscript, then distill.
Hi, thanks for your answer. When I use Adobe Distiller I can't see the spreads. Do you know why this happen? I mean, I only see the left page of the spread. Thanks
You have to use the ADPDF.PPD printer description file and set up a page size to fit the spread. There was a pretty long thread about this last week or the week before.