Mozilla Ubiquity can only explained by a video. Here we go:
Ubiquity for Firefox from Aza Raskin on Vimeo.
I must say that this is one of those projects that falls under the umbrella of a true "aha erlebnis". If Mozilla can pull this one off, this will be a massive, massive selling point for Firefox. Extend this to native applications as well, and I'm sold, where can I place my orders, I'm going to kiss the people who made this.
As for the logo contest, I'm not seeing any clear winners, but this is a project that doesn't deserve to have the attention focused on something as insignificant as the logo.