I've installed the tarski theme on my wpmu buddypress site and it looks great, except that I get the following warning at the bottom:
'Missing argument 1 for get_current_site_name(), called in public_html/mystic-minds.net/wp-content/themes/tarski/app/templates/credits.php on line 4 and defined in public_html/mystic-minds.net/wp-includes/ms-load.php on line 114
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[edited urls for at least a bit of anonimity here]
The site is: http://mystic-minds.net/philosophy/