A LaTeX package that can re-define the plain page style under the control of options, so you can have page numbers: at the top or bottom of the page; in the inside corner, outside corner, or in the middle. It was inspired by Axel Sommerfeldt's rplain package.

The same results may be achieved (as well as many other convenient running head/foot effects) by using fancyhdr or titleps

The author is Rowland McDonnell.