First time I noticed this on the homepage... Just another thing lately that google has done that makes no sense....
Yeah!! I noticed that a few days ago when I upgraded my toolbar. It looked like another useless service and I just disabled that.
Its definitely not useless, by using google sidewiki you can comment on any websites which can be viewed by the site owner if they also installed google sidewiki.
yes that's right but why to do that. It really slows the speed I beleive too. Even I think people haven't used it much as I found very less comments in this in so popular sites even,