I also would like to be able to display the Expired announcements to unauthenticated users.  Is Scott correct in that there is no way to do this?

Thanks.

You should be able to use the Reports module without having to create your own module.

SELECT     ItemID, ModuleID, CreatedDate, Title, URL, ExpireDate, Description, ViewOrder, CreatedByUser, PublishDate, ImageSource
FROM         Announcements
WHERE     (ModuleID = XXX) AND (ExpireDate < GETDATE())
ORDER BY PublishDate DESC

Use XSLT to control the output.

Other options are, of course, to use a different module.  Ventrian Articles is a commonly used module that, IIRC, lets you display "expired" announcements.