LIS in Oz

This days, I am trying to choose a tool to do social bookmarking with my colleagues at work. So we could share our bookmarks and make the most of each of us discoveries, and perhaps share it with our "clients" !
It seemed quite easy to me, but I realize that lot of tools like that does exist : how to choose ?

Here are some links very useful : the blog 3spots who gives a list of the existing tools : ALL Social that CAN bookmark, and another list of Office 2.0 tools : Database Office 2.0.

I've already tried at least 20 of them, but I'm still hesitating between two or three : blinklist (which is at this point my favorite for a personal use : see my bookmarks on this page), furl, and netvouz.

I try to see the advantages and disadvantages of each of them by using them daily. I will make my choice very soon !