Mike Love and Al Jardine lead what passes for the Beach Boys these days.  They're doing the county fair and winery circuit these days, I think.

I've seen Brian live twice in the last 4 or 5 years and he's got one of the best performing bands I've ever heard.  They do Beach Boys tunes better than the BB's in their prime ever could, even with Dennis and Carl around.  His newer material is hit and miss, but his official version of Smile is pure brilliance!