First modify the Default.aspx file so the title tag becomes a control:
<TITLE id="PageTitle" runat="server"></TITLE>
Then in the code behind for the Default.aspx file add the following (about line 257):
CType(Me.FindControl("PageTitle"), HtmlGenericControl).InnerText = strTitle
Then in your module code, whenever you want to change the title tag add something like the following:
Try
If Not Page.FindControl("PageTitle") Is Nothing Then
CType(Page.FindControl("PageTitle"), _
HtmlGenericControl).InnerText = MyValue
End If
Catch ex As Exception
End Try
This should now change the title tag to match the headline of the article.