None of us would have seen an effect on pagerank since we started doing it right before the update. But some of us have experienced an increase of traffic coming from Furl users. You can Furl and then uninstall if you want to.
There are other pages that the link shows up on, more in the background. Over the last few days I've gotten a couple of hits from these pages. I'm not sure how well these are spidered though. Also if you have enough people furl to the same site you get put up on a page for high rankers. Only time will tell if this does any good. MSN goes through phases where it seems to show all the links it has for you. In a week or so when it's showing all my links I'm going to check to see if the furl pages show up. If not then this was a wasted effort, but hard to tell at this time.
U made me laugh today, this furl is really a magic that gives wings to sites.... i am sorry if it really hurts anyone but, its not that much useful for backlinks...