WordPress MU

I tried searching the forums and just didn't find quite what I was looking for.
I have site with many different blogs, and want to have a common sidebar menu for all of them. I created a category for each blog, thinking that I could use the categories, but the code from sidebar:
<?php wp_list_categories('show_count=1&title_li=<h2>Categories</h2>'); ?>
is blog specific and not site wide.
Is there any simple way to modify this so my category dropdown in the theme sidebar.php is a list of sitewide categories ?
If this is not the best way to handle this, I am open to doing another way.
What I have is 1 blog, which is translated to 27 different languages, each as its own blog with language specific menus and the content translated by translation team of volunteers. I am trying to have sidebar menu which will list all the separate blogs to be easily switched between.

http://mu.wordpress.org/forums/topic.php?id=10339