Apple has officially launched the iCloud web apps. There are only five at the moment and who knows, they may add more as the site evolves. Anyone with an Apple ID can log in but there is not much you can do if you do not have a developer account.
Apple are known for great aesthetics in their products and they have not failed here. The design of the site and web apps are minimal and the apps specifically look like their iPad counterparts.
Hopefully once it is officially launched there will be at last an easier way to access your Pages, Keynote and Numbers files. As many iPad users will know there is no easy way to transfer your work files from your iPad to your computer without iTunes which I find absolutely ridiculous.