Avoiding widows/orphans in Latex
http://www.economics.utoronto.ca/osborne/latex/PMAKEUP.HTM – a nice tutorial how to make the camera-ready version of your latex document even more beautiful by removing Overfull \hboxes and avoiding widows and orhpans.
What worked really well for me was:
\def\longbookpage{\enlargethispage{\baselineskip}}
\def\shortbookpage{\enlargethispage{-\baselineskip}}