“To bookmark a page, just visit it through Google Search, get to it in your Search History, and click the star icon. Then click â€œeditâ€? and type in any tags under the â€œLabelsâ€? heading. You can even add some notes in the box underneath that.
Once youâ€™ve saved a bunch of sites, you can view them by clicking the Bookmarks heading in the left sidebar. You can show multiple tags at once by clicking all of their check boxes.” (link)
The interface seems clumsy and the private-only tags are not very useful, but this will no doubt grow into something significant.