Create a sidebar for a specific page with the Genesis Framework, without a new template file.
Saving useful code as I find it, build it, or stumble into it.
Alternate Sidebar Page Template in Genesis
This allows you to use the built-in secondary sidebar as an alternate on one sidebar themes (you'll want to register a separate sidebar if you are using two sidebars in your theme layouts). This has a limited scope, I would recommend a plugin like Display Widgets if you are going to have a more complicated page-by-page application.