Google Spreadsheets, an AJAX Application
Google has come up with a new AJAX application called Google Spreadsheets. It is still in the development phase. It is similar to microsoft excel in several ways such as formulas, sorting etc. One can easily perform collaborative task with
Google spreadsheets which implies that two people can work on a spreadsheet and share the changes at the same time.
As of now the spreadsheet is in the testing face therefore one would be requiring an invitation issued by Google in order to use it. Like other Google products, using Google Spreadsheets does not require a fee.