Fantastic! Thanks so much for putting this together.
We're now getting to the stage where we've made enough search improvements, and got enough more improvements planned, that they are likely to interact quite significantly. This is where stepping back and thinking about how we can present that interaction to the user in a consistent and logical way can significantly improve the user experience. I'm really looking forward to this.
I'm a bit too tired to think about this too much now *shakes fist angrily at jet lag* but I'll do so in the next few days and leave some comments.
Thanks,
Dan