you know it's funny how google has overtaken the world - the single most important reason I use FF and never Opera is thet the google notebook extension works only on FF (and IE but that peace of crap doesn count as a browser lol)
I actually just noted this hread to my google notebook..
thanks OP for the news I just blogged about sleipnir. It's actually pretty epic - there have been only three browsers for windows up ot this date