Save the PowerPoint slide as a .jpeg
and then use a different software (such as the ones mentioned in your link) to print as a poster.
In PowerPoint 2007 (or 2010):
Go to the Ribbon Start Menu, click Save As
, then Other Formats
:

Then in the dialog box that appears, under where you can name the file, there is a drop-down menu for all the formats you can choose from:

Choose .jpeg
(or another photo format), name the file, and choose Save
. If you have more than one slide, it will ask you:

If you choose Every Slide
, it will create a separate .jpeg
for every slide and tell you where they are stored, like so:

(the blacked-listed text is the file location).
Then, as I suggested earlier, just open the photo in another program and print on multiple pages.
+1, but really you should save as a PNG if you're going to be printing it out afterwards -- don't want to lose any more quality than you have to! – Matthieu Cartier – 2011-01-25T19:24:21.027
okay, PNG then! it has an option for that too. – studiohack – 2011-01-25T19:31:32.800