I’ve come across a few references to Ubiquity, a prototype Firefox service that looks very exciting. There’s a cool demonstration video as well.
Ubiquity looks very similar in concept and execution to Quicksilver and Launchy, 2 programs I think are essential for their respective OS. For example, on my mac I use quicksilver to launch pretty much everything, from sending an email to opening a web page.
Whilst I do have a small concern that ubiquity may limit users to just the default corners of the web (Gmail, google maps, yelp, flickr etc.) it does look like a great step forward in making it easy to access content as we want it.
With Option+Space reserved for quicksilver, ctrl+alt+space for Omnifocus and now a keypress to find for this the hardest thing is going to be remembering the trigger commands!

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Quicksilver looks very interesting. I suspect I am too stuck in my command-line ways to move onto using that sort of thing any time soon, though.
I am not very skilled at command line-fu, but I find quicksilver works exceptionally well. Probably the most ‘essential’ app on my mac.