You can add a checkbox from the custom tool box (Use Office button >
PowerPoint Options > Popular to enable the Developer tab)
You might also like to read this if you find the ones above too small.
"CheckBoxes with triggers"
http://www.pptalchemy.co.uk/powerpoint_hints_and_tips_tutorials.html#triggers

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> Is there a way to add checkboxes in PowerPoint 2007? I'm looking to make a
> list of items for a presentation and I'd like to add a check mark after each
> one as I finish talking about it. Is there a way to do this?
>
> Thanks in advance!