Since this morning, Google Calendar (renamed Google Agenda) is avaible in french, german and 16 other langages. The SMS notifications works very well with french carriers.

It's interesting to see that Google are localizing their service names:

English:
http://www.google.com/calendar/images/calendar_sm2_en.gif

Spanish:
http://www.google.com/calendar/images/calendar_sm2_es.gif

German:
http://www.google.com/calendar/images/calendar_sm2_de.gif

French:
http://www.google.com/calendar/images/calendar_sm2_fr.gif

Italian:
http://www.google.com/calendar/images/calendar_sm2_it.gif

(Notice how the Italian and Spanish logos is different to the English one even thought it says the same? Weird!)

The "quick add" option for events is gone in the German version. Looks like they didn't translate the part of parsing free style event descriptions.

Next Google product translated will be imo Google Pages as it would make sense to translate all the apps of the Google for Your Domain package.

And SMS works also in the Netherlands, this is great!

"Google Agenda" in French, lol ^^ There is a word for "Calendar" wich is "Calendrier"... :-)