Are you seeing default.aspx after Pages in your SharePoint breadcrumb navigation?
I found a simple fix for this problem in MOSS, modify the master page.
Open the master page and look for PlaceHolderTitleBreadcrumb
To quote from my reference
When you’re creating a new Page Layout, make sure you override the Title Breadcrumb with something that uses the CurrentNavSiteMapProviderNoEncode provider.
Heather Solomon has written a great post detailing the behaviour of out of the box page layouts breadcrumbs. She has also linked to other resources for how to modify and use the breadcrumb.