Numbers, now at version 1.2, introduces improved exports, object grouping and ungrouping, and better hyperlinks, among other new features. Pages, also updated to version 1.2, provides WebDAV and MobileMe iDisk support, txt file compatibility, and many performance enhancements. The third member of the iWork family, Keynote, has added new animations, the ability to group and animate objects, and export to PowerPoint.
Pages, Numbers, and Keynote cost $9.99 each on App Store. Updates are free.