You can use google analytics with bp. Other people are using that package now.
It is just a WPMU plugin that adds the code to every page, not theme specific so it works with BP as well.
Trent
You can tryout Buddypress Analytics Plugin at https://wordpress.org/extend/plugins/buddypress-analytics/
This plugin will allow you to use your analytics script with your buddypress site (with wordpress mu) Supports any analytics script including but not limited to Google Analytics.
More info at http://www.pingsense.com/2009/11/buddypress-analytics-plugin/
That plugin is throwing errors
function bp_ga_analytics() { echo ‘ ‘; } add_action(‘bp_after_footer’, ‘bp_ga_analytics’);
I think you need to add your GA code to it. 
I’m not the author of that plugin, but I’ve rewritten the code for it, it’s available here:
https://buddypress.org/forums/topic/buddypress-analytics-kills-dashboard#post-31962
@Ekine,
Eric Johnson and I are developing a plugin to track individual user activity within BuddyPress. More info can be found here: http://heavyanalytics.com.
What info, specifically, are you trying to track? Perhaps we can build it into our plugin.
Toby
