Colour scheme is easier to read now, for sure. I like the navy background, it's a nice contrast to the black and the white.
The pink Vivaldi text in the title looks kind of anti-aliased or something, quite choppy around the thinner parts (I still think that's not really an appropriate font for this site, particularly the way it displays now).
The spectrum thingy behind the title is an improvement over the other one in my opinion. This one I haven't seen a bazillion times all over the web (yet, anyway, hehehe
).
The edges around the multi-colour brain-in-head guy look really odd and soft. I'm guessing you were trying to take it from a dark background to alias with the white? That's probably not necessary. You could keep the dark background for it, slap a little border on it, and it'll sit there and blend in with the site nicely. Now, the edges look all soft and weird, and not in a good way.
But other than that the colour scheme change is a big improvement to my eyes.