We have one of these in the kitchen: http://www.littlepartners.com/products/The-Learning-Tower.html

We were leery because it is a bit expensive, but it's been really nice. L climbs up it to watch us, we put it by the sink so he can wash his hands, we figure soon we'll use it so he can safely work at the counters.

Yesterday he both figured out he could AND that he now has the strength to drag it around. We are not impressed with this new skill.

Still, stable. He's fallen off chairs and tried to knock them backwards. This is so much nicer.