The tree-view in SharePoint 2007 provides a great alternative to the quick-launch for navigating the lists and libraries on a SharePoint site. It is particularly useful when you have a deep structure of nested folders, or users that are just more familiar with that style of navigation from using Outlook and Windows Explorer.
One of the added benefits is that once you've turned on the tree view, you can now configure the quick launch for links to things other than basic list and library navigation. For example, you could have a tab called My Content that has sub-menu items pointing to the My Tasks and My Documents views.
With this new use of the quick-launch, you may find it preferable to also give it a new position and style on the page. Those using MOSS will have come accustomed to the horizontal tabs with ability to have a second level of drop-down or cascading sub-tabs. Well, the same thing can be done in WSS also simply by making the quick-launch horizontal and giving it the same style as the top-link bar.
Here is a
demo site. You can download the master page and site template from
Codeplex. Don't forget to activate the tree-view after creating a new site with the template.