iWork '05 on 2 Computers?

Standard Apple single-user license agreement
http://docs.info.apple.com/article.html?artnum=26275

"Permitted License Uses and Restrictions. This License allows you to install and use one copy of the Apple Software on a single computer at a time. This License does not allow the Apple Software to exist on more than one computer at a time, and you may not make the Apple Software available over a network where it could be used by multiple computers at the same time. "

There is a family pack which allows you to install in up to 5 machines in the same household.