How can I view PowerPoint files on an iPad?

If you have only small amount of presentations, which you want to play on iPad, you can convert pptx file into jpg's or pdf's on PC and then upload it to iPad

I don't know any free Power point viewer for iPad but I can suggest 2 solutions:

Transfer PowerPoint to PDF files:
and use pdf viewer to read your slide
Export PowerPoint slides as pictures

If you get a Windows Live account (you can use any email address to open one, but you will already have one if you have a Hotmail account), you can upload your PowerPoint files to SkyDrive, where you can use the PowerPoint Web App to view and even edit them.

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