Free Web-Based Spreadsheet by Google

Google has been launched its Free Web-Based Spreadsheet recently, provide an online spreadsheet editing platform for everyone and for those still filling up his "piggy coin bank" for a Microsoft Office Professional Edition 2003. It has the basic functions such as formatting, sorting and formulas. Upload your own CSV or XLS files won't void your document's formatting and you'll never lose your works when there is a power failure since Google Web-Based Spreadsheet is an online storage with auto-save feature.

Google Web-Based Spreadsheet | source