There is a list of all available Macintosh OS X key shortcuts in a PDF (or three). This includes foreign characters, mathematical symbols, and more. So if you want to write en français, you can – or enjoy writing about a delicious éclair – or about that new hôtel de Paris – you can. You can écrit des articles en français et discut les ordinateurs toute les jours!
(Okay, so I speak – or try to speak – French. I believe that I already wrote about using foreign languages….)