I very much agree with locative. Other people have said that this isn't important or unrealistic, but I think it's essential to building a world-wide community. There should be an option that automatically translates your tags into other languages, making it at least slightly more possible that you will find people in other countries, speaking other languages, who are interested in the same thing.

I know that some translations will cause problems, but those problems (multi-lingual mismatches) would be worth it to me, if I knew that my tag had a more international audience.

I would like to see a drop-down menu for comments in flock and firefox the way you have it in the Safari "Diigolet" toolbar. It's really nice to be able to see at a glance the comments or sticky notes without actually opening up the entire bookmark window.