@bathurst_guyJul 08.2007 — #I would probably go with percent rather than em as I wouldn't want the page layout to change if the end user modifies their text size. It depends on what though, I might prefer to use em for a navigation menu.
@knowjauthorJul 08.2007 — #I was just thinking about the problem with text expanding outside the containers with held with in which is a common problem i come across when testing a site for accessibility.
It's mainly to get some personal opinions as with the web there is rarely a fixed method/standard with these types of things. with pros and cons to all methods.
I'm starting to think its all based on the site design which you choose.