This script basically allows you to set specific zoom sizes for specific sites.
It uses a combination of relatively new standards built into Opera 10.5 , CSS 2D transforms and Javascript localStorage object, to be able to zoom the page, and save it.
It requires a javascript bookmark to be able to save your zoom level.The code for this is below. As it wouldn't be possible to have a consistent UI with it. But it mostly works for the main part.