We are using jQuery and ExtJS in a project. ExtJS's custom theming capabilities are very weak and I would LOVE to utilize the jQuery theming engine with Ext. Does such a thing exist or would it be strictly manual and painful process?
It would be a manual/painful process, the themes/classes are built specifically for/with the jQuery UI widgets (and themeroller is updated when jQuery UI is, for new classes and such).
There are some helpful options out there though, like the ExtJS Color theme changer and the ExtJS theme generator.