I think Google Sidewiki is great news for the web - in particular it is a step in the right direction to address a long standing problem of censorship on blogs. Especially on political blogs, it is possible for the owners to remove and edit people’s comments or ban comments entirely - Sidewiki puts an end to that. Though I suppose it is still possible for mobs to vote comments down. Here’s a nice example of it used to comment on a blog where comments are completely disabled. Nice job Google. (Of course, it was always possible to start your own blog and comment on anything there. However, unless your blog ranks you may as well be talking to yourself. Nobody will see it. This provides a venue for the other side of any story to be heard, right by the actual story.) Note: Firefox/IE only for now, unfortunately.