Paris stuff

Favorite attraction: Musée d'Orsay
Favorite artist: Pierre-Auguste Renoir ( Le Moulin de la Galette 175K)
Favorite place to eat: Campagne et Provence on Quai de la Tournelle, left bank
Favorite view: Looking down from the Arc de Triomphe at rush hour traffic
Favorite foods (tie): Baguettes, baguettes, baguettes and selecting an unrecognized cheese at the nearest fromagerie because it looks weird.

Personal picks, above
The Lourve, of course
The Cathedrals - Notre Dame, Sacré Coeur, St. Severin, St. Sulpice
Conciergerie and St. Chapelle
Musée Cluny - middle ages
Invalides - Napoleon's tomb and Musée de l'Armée
Place de la Concorde and the obelisk from Luxor
Gustave Eiffel's tower, built for the 1889 World's Fair, and nearly pulled down in 1909
Musée de l'Orangerie - if you liked the impressionist stuff from the Lourve and d'Orsay
Musée Auguste Rodin - something to Think about
City ruins beneath Notre Dame, dating back to 300 A.D.
Jardin du Luxembourg

Bring comfortable shoes, and don't sprain you ankle the first day.
The Metro rules - take it everywhere.
Get a museum pass, and use it heavily till it expires. Hit the museums early, leave when the art seems merely "nice", return the next day.
Buy lots of the postcard-sized prints of the artwork you like, because they're waaaaaaay better than your photos will turn out.
Use your Cirrus ATM card to get cash - easy and better exchange rate.
The Streetwise map of Paris landmarks is really useful.