Apple has inadvertently posted a screen shot on the new iPhone 4 pages of its American website showing the option to open an attachment "in Keynote".

Currently Keynote, which is part of the iWork app suite and only available on the iPad, isn't available on the iPhone.

Could Apple have made a faux pas, detailing too much in its excitement to spread the word about the new iPhone 4? Or is it merely a mistake on the company's behalf.

Previously iPad-only, the iBooks app has already been confirmed for the new iPhone OS, called iOS 4. However, there has been no word to date about iWork for the iPhone or even the individual apps: Pages, Numbers or Keynote.

Would you like Keynote on your iPhone? Let us know what you think in the comments below.

Check out our iPhone 4 homepage for all the latest iPhone 4 coverage.

UPDATE: Looks like Apple's spotted it's faux pas and changed the image to one that features iBooks instead. 

We will keep you posted.

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