I won't comment that if it's not worth paying for....
But there are no free tools to give you the powerpoint "feel". Let's get past that and note that it is possible for you to create screenshots, place them into .JPG files and display such in a slideshow on the PDA.
You can work a little harder and do that instead. That's how it works.
Is there a freeware to view PowerPoint slides on the pocket pc? I've only been able to find a couple and you have to buy them