music database plugin, but this could certainly be swapped out for an ITunesMediaDB plugin (if someone wanted to create it). Contacts and calendar are separate but for good reasons, theres still nothing to prevent you from creating a linking plugin to link in the osx contacts and calendar. Although the bluetooth plugin would probably handle syncing with an iphone.
The default skin is trying to become as language neutral as possible (icons instead of text for things) but for other issues we run in .net which means we have native support for unicode and multiple languages.
There are plans for an automatic localization plugin but thats rather long term. When created this would automatically translate plugins to the users language so you get write once deploy everywhere functionality.