Making Screen-Ready PDFs

Is there a quicker way of making screen PDFs from print-ready PDFs?

Miller, James. PDFzone (2003). Articles>Document Design>Software>Adobe Acrobat

Sizing PDFs for Posting Online

What is the preferred maximum target file size for PDFs that will be accessed online by average users?

Miller, James. PDFzone (2003). Design>Web Design>Software>Adobe Acrobat