GOOGLE HAS introduced a new facility called Sidewiki (SW) recently. Sidewiki is a browser sidebar that lets you contribute and read information alongside any web page. Using Sidewiki anyone who reads a web page may add additional information relevant to that page that will appear as a sidebar entry.
One needs to download Google toolbar and enable Sidewiki option within it to use this facility. Thereafter on any page you browse on the net, you will see SW icon in the left vertical bar. Clicking it enables you to make an entry. Once you have made an entry (like adding a comment) it is available to all who have logged into their Google account (any one of Google Services).
This tool may be used by experts to provide additional insights, give extra tips or examples, offer background or historical info, or add a different perspective etc. Standard comments that we make at the end of a blog post or some article reside in the website of the blog or the concerned website. SW entries reside in Goggle SW server. A SW entry is just shown to the user alongside the relevant page. SW is available for IE and Firefox at this moment.
Once you have made an entry in SW you can share it with your friends. You may send it via email, mention it via Twitter or upload it to your blog. All entries you have made can also be seen in your Google Profile, accessible to all.
Sometimes you may not see the SW icon on a web page. Here are some reasons: You may be doing 'private browsing' in IE or Firefox. Or you may try to access an internal secure page (say https). The SW server may be temporarily unavailable. You need to ensure that you are logged into some Goggle service like Gmail, Pages, Orkut etc.
If you desire to learn current developments in this emerging and fascinating technology you may follow it up on Twitter with the ID: googlesidewiki