BuddyPress.org

I have the same question.

My site is 960px wide, and the buddybar looks great on the site (so far) as it sits centered right above the content. But, I’d rather have the buddybar span the entire width of the site (think 100% or min/max) while the rest of the site is still 960px wide. This will allow the bar to properly appear on the members blogs and the blog admin screens.

http://www.mmaopinion.com (looks good, right?)

http://brandt.mmaopinion.com (see how the bar moves to the left?)