Apple has sent out reminder email to its iWork.com users that the website and its service will be discontinued as of 31 July 2012. iWork.com users are advised to download all their documents to local Mac before the cut off date.
Apple launched iWork.com website as a public beta on January 2009, which provides a web interface for viewing, commenting and downloading of uploaded iWork (Pages, Keynote, Numbers) documents. iWork.com does not provide editing feature and is not related to iCloud.
By shutting down iWork.com, Apple reduces the confusion as iCloud will be the only place to store your documents in the cloud. iWork apps for iOS support iCloud storage directly and there is an iWork area in iCloud.com website where you can access your documents in iCloud using a web based interface.
iWork app for Mac currently does not support iCloud storage directly. You can however upload and download documents to iCloud using the icloud.com website. iWork for Mac is expected to support iCloud storage directly with its next major upgrade.