We got this scooty toy for Christmas, but haven't tried it out yet. It has a compartment you could put a weight in, but its small, so its definetly for babies with advanced cruising skills. It looks fun because it has both the bar and a seat so they can play on it together once they are a bit older

The boys really like this walker/busy board. They started using it when they learned to pull up to a stand. Right now we have it flat on the ground and weighed down with board books, but we are adding the wheels back on this weekend. To be honest, they barely use the busy board, but do enjoy picking up items out of the basket while they practice their standing.