google docs and google spreadsheets...  

Google docs and spreadsheets are part of google's attempt to enter the off line office applications domain.

GS is a result of in-house R&D. It is much easier to collaborate using an online document, and worries about data corruption, storage and transferability are addressed, since the data is always available online. As you have already a Gmail account you can add GS to your list by accessing the "All my service" link. This will cause a script file which is the interface to be loaded. Once loaded, you are presented with the familiar spreadsheet grid. The true power of GS is enhanced collaboration where a spreadsheet can be maintained by more than one author. To start off, you click on the collaborate tab. Here you can enter the e-mail IDs of the people you would like to invite to collaborate on the spreadsheet.

GD is part of google's strategy to replace offline office applications with their online counterparts. Besides the functionality of GS, GD offers a few additional features like the ability to incorporate RSS feeds, the ability to track revisions, and the ability to publish a document to your blog. You can add the GD service as you do for GS. To start new document, click on the 'New document" link. To add viewers or other editors, use the collaborators tab.

Hope you find what you want. Thank.

related resource: data storage