snippets/microsoft/ms-office/excel/functions/ConcatenateRange.vba

Function ConcatenateRange(ByVal cell_range As Range, _
                    Optional ByVal seperator As String) As String

Dim cell As Range
Dim newString As String
Dim cellArray As Variant
Dim i As Long, j As Long

cellArray = cell_range.value

For i = 1 To UBound(cellArray, 1)
    For j = 1 To UBound(cellArray, 2)
        If Len(cellArray(i, j)) <> 0 Then
            newString = newString & (seperator & cellArray(i, j))
        End If
    Next
Next

If Len(newString) <> 0 Then
    newString = Right$(newString, (Len(newString) - Len(seperator)))
End If

ConcatenateRange = newString

End Function