Yep, definately a spot to attach a leash. The harnesses I use have a D-ring under the handle, I think the clean run ones have the D-ring on the handle. The D-rings are really sturdy - you see how much the flyball dogs can pull waiting for their turn and when you are out of the ring its easier to have them on lead so the lead attachment must be strong. And as double security you can also loop the lead through the handle.
I just ordered another competition one for Deska so I can use his current one around cars to give me more control. I went for a trendy 2-tone black and yellow (team colours). Hope Tully isnt jealous, may have to get her a two tone one as well.