As we all know iWork iOS apps, (Pages, Numbers, and Keynote) are working with iPad only. However, Apple has released an update on these iWork iOS apps and now all of these apps would be compatible with iPhone and iPod touch.
Having the iWork iOS apps available in iPhone and iPod touch, would be great as for iPhone and iPod touch users as we can edit and viewing documents at any time. Yet in my opinion, using iPhone and iPod touch to edit on the documents would be very hard as the screen is so small compare to iPad.