Im am still using Deer Park 2, on my windows xp (32 bit)

And it rocks, it works really well. There are things that do need working on really hard.

Things like links that were clicked and then going back not getting marked as visited if you don't refresh. Or the options menu not showing if you do not use the default theme.

As advertised it is a testing build but it is promising a lot, and i like those promises very well.