One of the most contentious issues in putting together a new website is deciding on the navigation. It is one of the areas where everybody is and “expert” or at least has an opinion. Sometimes it will be useful to test the assumptions with real people ie the users.
This article describes how to look for common problems with structure, words used, layout and usability.
It also recommends a set of tools that can help:
Plus advice on usability testing for live sites.