Remote

I have a new Mac Book Pro with Office for Mac installed. I want to use my iPhone to control my PowerPoint slides. Is there a preferred app. I see many for Keystone but not PowerPoint.

Not Keystone -- Keynote.

Microsoft doesn't yet support the iPhone, so you'll have to take the matter up with them. I'm sure they'll get round to PP for iPhone ... someday ...

Until that happens, why not a) dump that old dinosaur and use Keynote or b) open your PP presentations in Keynote and use Keynote Remote ($1, App Store) to play them?

You might tryout i-Clickr it's primary function is to act as a powerpoint remote. They have a light and a paid version.

i-Clickr PowerPoint Remote

There's also mypoint - App Store - MyPoint PowerPoint Remote

Also, Slideshow remote. App Store - Slideshow Remote

Remote Buddy AJAX Remote - control 100+ Mac® apps with gestures on your iPhone™/iPod® Touch // IOSPIRIT [EN]

There are a few more in the App Store. Just search for "Powerpoint Remote"

You could also you something like TouchPad. It has full trackpad/keyboard controls so you could easily use that. Works over VNC.