I've had several customers upgrade from SPS 2003 to MOSS 2007. A popular question is "Where did the Listings functionality go?"

In short, Portal Listings are gone in MOSS. Since listings were just an SPS-centric way of creating a link to something, it didn't make sense to have a non-standard way of doing this.  In an upgrade, they are converted into a List and Content Type called "Listing". The Portal Listings Web Part is replaced with a Content Query Web Part, which is much more flexible.  So no functionality is lost; it's actually more functionality than SPS.

Likewise, Areas are also gone...everything is simply a site.  They have been replaced by various publishing templates.

These two items (listings and areas) were SPS-centric and didn't make sense to carry forward.