In reply to humptydumpty:
> * is there a secret to climbing on polish?
Load your feet at 90 degrees to the rock.
> * does climbing on polished rock make you better at anything except for ... climbing on polished rock?
Yes greatly improves your foot placement and helps with core strength due to the different way you load your feet
> * are there any good drills you can do on really polished stuff, either to make it easier or which transfer well to non-polished stuff?
The same drills will work, but maybe concentrate on smearing techniques and foot work