Do you have employees or customers who working in various locations around the world?
The Translations macro can help you easily translate documents into other languages only as the need arises. It will insert several flags into the document. When you click on one of the flags, a new window will open with the translated version of the current page.
Right now, it is using Google as the translation engine, and is fixed at having English as the original language. However, the source code is available if you want to tweak it to meet your specific needs (just don't forget to contribute back any enhancements)!
If you want to take a peek at the code to see how the translations macro was constructed, you can get the source from svn.