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In some explanations, i ask to edit a php file. Be careful to edit them with a good editor like Notepad++ and open each file with the format "UTF-8 without BOM".

I'v added my first map in one of my post, but when try to see it there's an error message who tells me something like "This website require an API key...". What's wrong ?

For this plugin to works, you have to firstly ask Google for an API key (its free, quick and easy to obtain).

I'd like to get the Google maps interface in my native language. How can i do that?

Edit the file googlemap-en_US.po by using a PO file editor such as : KBabel (Linux) should be available as a package for your Linux distribution, so install the package. poEdit (Linux/Windows) available from http://www.poedit.net/. For french in this example, save it as googlemap-fr_FR.po a googlemap-fr_FR.mo will be automatically generated. Put the googlemap-xx_XX.mo file in the lang folder (under google-maps), the PO file is just here to generate the MO translation file...

Ok, i've done what you explain above, but the Google maps interface is still in english How to make it works?

Open your wp-config.php file (at the root of your blog) and search for : define ('WPLANG', 'xx_XX'); where xx_XX is your language. If this line doesn't exist add it in your file. Save your modifications and re-upload the wp-config on your server.

Does Marquee works with WP-MU?

Yes