I actually started using it today, maybe two hours before it got posted on Scobleizer and while I didn't experience any super-fancy code assist features, it is

I actually started using it today, maybe two hours before it got posted on Scobleizer and while I didn't experience any super-fancy code assist features, it is fast, responsive and does not get in the way. Fell in love right away and I am basically not a fan of hosted coding environments like this but as my code is pretty much standalone JS for now it seemed to make perfect sense. Basically I only went there because I had it bookmarked a few days ago and Aptana crashed my box when I tried to create a new file (yeah, I know, that was a wild idea). But now I am kind of glad I did. Too bad it's down right now but if you can't get through and haven't seen it yet, give it a shot some time later.