Ubiquity for Firefox from Aza Raskin on Vimeo.

And, similar to one of my favorite OS X launchers, Ubiquity also has an ambitious mission: to move beyond old idea key shortcuts by using user-extensible commands to intuitively hook together bits of information like model train cars:

Ubiquity’s interface goal is to enable the user to instruct the browser (by typing, speaking, using language) what they want to do.

[…]

We aren’t there yet. Instead, we have the rudimentary systems of structured natural language commands. You can select something and Ubiq “translate this to French”, or “email it to Jono”. In both cases, Ubiquity is smart enough to realize what “this” and “it” refers to, as well as knowing who Jono is (by talking with my web-mail’s contact list). It’s also smart enough to be able to understand commands like “map Chicago Comics” and “yelp Tapas near SF” and give you rich previews and search results to get you where you want to be quickly. Even better, both of those commands let you insert results directly into, say, an email you’re writing so that you never have to interrupt your chain of thought.

Install it, try it for yourself, and, as you get started, do make liberal use of the Key Commands page (only available after install). There’s also tutorials (that I have not looked at much yet) that show how to make and share new commands.