Agreed. I have been enjoying using A9 from Amazon. I primarily use it for research. Although it is not set up for sharing, it easily allows the addition of bookmarks, a search history, and is useful when you use a lot of computers.
For me, I think (if I ever actually start doing it), I think it would be a good place to have my bookmarks. I don't care about the sharing, I just use a lot of computers and would like to be able to remember all those sites that I forget on a daily basis.