For figures on facing pages:
- Jim Fox's
dpfloatpackage defines two environments,
fullpage, which force the figures onto a left page and the following right page. The documentation is simple and clear.
- Martin Scharrer produced a beautiful piece of code that divides a single image into two halves and spreads them across facing pages. See http://tex.stackexchange.com/a/23865/3935
Parallel text on facing pages can be handled with the
parcolumns packages, and there are probably other solutions, too.