Google SpreadSheet
 

Google released their new test product called Spreadsheet. Its online but lightweight version of Microsoft Excell. The product is in test phase and is available only by invitation.

Here is how to invite your friends for spreadsheet account..

Once you get one account its very easy to invite your friends to spreadsheet. Google Spreadsheet has this feature where you can have more than one person view/edit spreadsheet. So to invite your friends to get spreadsheet account, all you have to do is create a dummy spreadsheet document and invite your friends to ‘edit’ it. Google will send them one link by which they can use the spreadsheet, thus getting them in (without waiting for invite from google).

Simple enough huh!!