One of the more common things to customize in SharePoint 2003 (both WSS and SPS) are the pages that display lists or document libraries. Users end up on those pages when they click on the list/document library in the Quick Launch, or on the web part title that’s displaying the list/document library data. Those pages can be customized but you need to build your own site definition or you need to use FrontPage.
The good news is that in SharePoint 2007 (both MOSS and WSSv3) those pages are editable from within the web user interface. Just navigate to the page and click Edit Page in the Site Actions menu.
Once you are in edit mode you can customize the page by adding web parts to it. Or you can choose to edit the web part that is displaying the list/document library data!
