PageSpot facilitates more complex layout options for Pages, and dynamically assignable sidebar content on a per-Page basis.
An example PageSpot template, pagespot-nsew.php, with spots for North, South, East, and West
Adding PageSpot snippets to be reused in public Page layouts
After selecting a PageSpot template, you can assign pages to fill in the spots in that template
Creating selectable Sidebars by adding child pages to private "[Sidebar] Foo" pages
Assigning a sidebar to a Page