Frank Barrett over on TravelMail (11 Jan 08)(the online version of the Daily Mail’s travel section) has a nice little article and video showing how to do Paris in a day trip from London on Eurostar.
The ‘Big Five’ Paris attractions are reckoned to be the Pompidou Centre, the Louvre, the Musee d’Orsay, the Eiffel Tower and the Arc de Triomphe. Actually, the Arc is best viewed from the other end of the Champs-Elysees; I would substitute Notre Dame.
Cannot disagree with that list, which would also allow you to enjoy the delights of the Seine , the Jardin des Tuileries and the Champs Elysees. You can see the video here.
