I'm doing some research about areas in SPS 2003. During my research i found a control called BreadCrumbTrail in the namespace Microsoft.SharePoint.Portal.WebControls which indicates were the current area is in the portal structure. Some googling brought me to the blog of Manuel Montes. He gives us an example of how to use the control. Thanks Manuel! :)  

See below:

• Open any of the default.aspx pages for an area template in your favourite editor. For example, the SPSTOPIC\default.aspx page.
• Locate the following code that renders the page title:
  <tr> <td ID="onetidPageTitle" class="ms-pagetitle"> <SPSWC:CategoryProperty runat="server" Property="Name" /> </td> </tr>
• Comment this entry
• Replace the code with the following:
  <tr><td><spswc:breadcrumbtrail id="BreadCrumbTrail2" runat="server" titlelocid="MultiPage_BreadcrumbWebPartTitle" verticalmode="false" frametype="None"></td></tr>

Note that you will need to give the control a unique ID ("BreadCrumbTrail2") ast here is another control already on the page.

• Save the Page and take a look… You should see something like this in place of the Page Title.
  Back to: Home > Topics > Applications

Changing the appearances can be done changing the following styles:

.bc-cell
.bc-htable
.bc-trail
.bc-leadin
.ms-vb bc-cell

http://pasteldelimon.blogspot.com/2005/06/breadcrumb-links-for-sps-areas.html