Yes, I have set the xhtmlConformace mode to strict.

Well, after going through the DNNWebControl source code I managed to change the <span> tag to <div> tag.

What I've done was overrides the TagKey method and return a div tag instead.

Here is the code, I added this into property section

<Browsable(False), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)> _
        Protected Overrides ReadOnly Property TagKey() As HtmlTextWriterTag
            Get
                Return HtmlTextWriterTag.Div
            End Get
        End Property

I've got a table-less skin and pass the xhtml 1.0 transitional validation.

Will require more work to validate with xhtml 1... any help would be appreciated.

Cheers