Apple’s iWork suite of productivity apps have been updated to work on the iPhone and iPod touch, according to a press release from Apple.

Keynote, Pages and Numbers are now universal apps that run on iPad and iPad 2, iPhone 3GS and iPhone 4, and iPod touch (3rd & 4th generation), according to Apple. The apps are available from the App Store for $9.99 each for new users, or as a free update for existing iWork for iPad customers. Keynote Remote is sold separately via the App Store for 99 cents.

It remains to be seen exactly how usable these apps will be on the iPhone, but the ability to create and edit iWork documents on small iOS devices is sure to come in handy.