Google Spreadsheets now as a Wiki!

Google Spreadsheets, the online spreadsheet program that is part of Google Docs, has just added a new feature by which you can make a spreadsheet open for editing to anyone and everyone.  Before, you could invite collaborators but you had to provide them with a link that included a secret code so only invited people could participate.  Now you can have it open for anyone to click a link from a web page or blog and edit in real-time with many others.  See a full explanation at