Wouldn't be it great- dont know how it would work;

You have IE7, FF3, and Chrome.

You add a bookmark to one....and the other two automatically add it too.

I don't guess anything exists, but it would be good, IMO.

Well Google freed up the source code to google browser sync after they discontinued it

sorry, here's the link to the post about that http://google-opensource.blogspot.com/2008/07/open-sourcing-browser-sync.html