Yes, poly bushes. Many on here knock them, but I've used poly bushes on every car I've ever had to replace bushes on, and they are much, MUCH better than rubber ones. Improved geometry control, handling, and last longer.... AS LONG AS they are fitted correctly. Poly bushes require lubing with copper grease before you fit them, in order to ease fitting of the suspension part back into it's mounts, because they generally take up the 'spare room' in the joint left by most standard rubber bushes - if you don't lube them, the arm / wishbone / joint can be a nightmare to get back into place. In addition, they can tend to chafe and squeak in a way that rubber ones don't, and this is the reason many people find them failing prematurely. I have to say I've never had a problem with them, and given the choice would never fit stock rubber bushes to ANY car.
But... I don't yet know if the same holds true for heavy-duty, live-axled 4x4s or not yet... Time will tell.