Shoutbox

Use a VBA macro...

Visual Basic code:

---

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    Target = Target + 1
End Sub

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Obviously just add a few conditions if Target is column A for example and if Target <> ""

EDIT: A bit more in depth:

Visual Basic code:

---

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    If Target <> "" And ActiveCell.Column = 1 And ActiveCell.Row < 50 Then
        Target = Target + 1
    End If
End Sub

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ActiveCell.Column uses numbers to represent columns instead of letters so A = 1, B = 2 etc.