Today, Google announced new versions of applications for working with documents, spreadsheets and diagrams. They will be available in the next few days.
Among the features:
Edit documents in real time (a la Google Wave)
Chat Sidebar
Field / Alignment Rulers
Improved work with images inside documents
Optimization of work with tables (increased download speed and response)
Ability to transfer columns
Simplified navigation between sheets
New schema creation tool ( Drawing Editor )
New editors are not working with Gears yet (planned to be introduced later on the basis of HTML5). Under habrakat - video.