Google has added an option into Google Spreadsheets, that allows anyone to view or edit the spreadsheet just by knowing the URL. To use this feature, create a new spreadsheet at Google Docs, — click on the Share tab and enable “Anyone can edit this document without logging in”, your spreadsheet becomes a wiki that can be edited by anyone.

In other spreadsheet-related news, you can now embed forms in a web site by just copying some code, there's a new option to duplicate questions and users can add their own answer to a multiple-choice question.

Source:→ Googlesystem