Usually I'm using two web broswers: Firefox and Chrome.
I always tried having one bookmarks set. I never found a way to share them between those web browsers. I've tried exporting bookmarks from one browser and importing into another, but that didn't feel right.
Luckly, yesterday I found Xmarks. Now my bookmarks are in the cloud :)) and I can share them easyly between Firefox and Chrome, since Xmarks has plugins for both.