Hi Tony,

PowerPoint often makes users feel stupid, it's just one of those apps where deviating just slightly from a basic requirement becomes a battle. I've done a fair bit of coding in it so this comes from bitter experience.
It's object model isn't very flexible so you tend to have to take a long route to where you want to be rather than tweaking properties here and there. You could go to the Notes Master and remove the slide placeholder and enlarge the text box but getting it to print 4-up on A4 won't happen natively (shame because it could just be an extension of the ability to print the slides in handout form - x per page)

So the manual option would be to do the notes in a seperate presenation and print the it in handout form - 4 per page. Getting the full size on each quarter page will be difficult.
If this kind of thing were likely to be needed regularly, I would be inclined to spice up the functionality of PowerPoint by making a custom print routine that makes a temp presentation and adds in the text from the notes slide layed out and formatted appropriately.
I've put a routine together that does that - needs some tidying up... [VBA]Sub PrintPostcardNotes()

Dim presActive As Presentation
Dim presPcards As Presentation
Dim sldPcards As Slide
Dim shpText As Shape
Dim t As Long, i As Long
Dim tl As Single, tt As Single, tw As Single, th As Single

Set presActive = ActivePresentation
Set presPcards = Presentations.Add
With presPcards
.PageSetup.SlideSize = ppSlideSizeA4Paper
t = 1
th = presPcards.PageSetup.SlideHeight / 2
tw = presPcards.PageSetup.SlideWidth / 2
For i = 1 To presActive.Slides.Count
Select Case t
Case 1
Set sldPcards = .Slides.Add((presPcards.Slides.Count + 1), ppLayoutBlank)
tl = 0
tt = 0
Case 2
tl = 0
tt = th
Case 3
tl = tw
tt = 0
Case 4
tl = tw
tt = th
End Select
Set shpText = sldPcards.Shapes.AddTextbox(msoTextOrientationHorizontal, tl, tt, tw, th)
With shpText
.Line.ForeColor.RGB = RGB(0, 0, 0)
.Line.Visible = msoTrue
.TextFrame.TextRange.Text = presActive.Slides(i).NotesPage.Shapes _
("Rectangle 3").TextFrame.TextRange.Text
'note with the previous line, I'm being lazy since "Rectangle 3" is
'the default name the notes page textbox will have, it's by no means
'guaranteed. You might want to look at that
.TextFrame.TextRange.Font.Size = 10
End With
t = t + 1
If t > 4 Then t = 1
Next
'You might want to stop here and check the text fits in the textboxes
'.PrintOut
'.Close
End With

End Sub[/VBA]