Stephen Huen has written some great articles/samples up on Code Project.

Go and check them out now:

MOSS 2007 Vertical Navigation

For use in a Microsoft Office SharePoint Server (MOSS) 2007 Publishing web site, This custom control is an alternative to the out-of-the-box "Current Navigation" aka AspMenu. It renders navigational nodes using list tags like

 

MOSS 2007 Site Map Web Part

For use in a Microsoft Office SharePoint Server (MOSS) 2007 Publishing web site, this web part displays the site structure in a hierarchical tree that is expandable and collapsible. It is based on my Site Map custom control written for Content Management Server 2002.

 

MOSS 2007 Summary Links

For use in a Microsoft Office SharePoint Server (MOSS) 2007 Publishing web site, this user control displays a summary list of page links for a sub-site and optionally selected page field values. It offers features similar to the out-of-the-box Content Query Web Part but is written as a user control.