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Ubiquity for Firefox
Pretty cool?
its basically an addon which attempts to make the internet easier. Its got lots of cool features but its gonna get way better probably.
The best thing i use it for is highlighting stuff, like you can highlight a word and then you press CTRL+SPACE and you can tell ubiquity to wiki it or tinyurl it and it does it for you so you dont have to go to tinyurl.com, heres a video which explains it better...