Here are some strong recommendations, based on experiences both at the Geometry Center and at other institutions with which I am familiar:

• Clearly separate individuals' personal pages from official pages.
• Carefully design your official pages, and stick with that design.
• If necessary, periodically redesign the whole thing, but try to avoid making miscellaneous exceptions.
• Always review official pages before putting them in place.
• Clarify responsibilities and policies, including but not limited to:
• What will be on official pages.
• What must / may / must not go on personal pages.
• What documentation or clearances are required (e.g., copyright clearances to include the work of others).
• What else?