Although I like the minimal setup i.e. just a bookmarklet, I don't see why I would ever use this over ubiquity. Perhaps browser-independence? If that's your thing, I'd recommend <a href="http://queri.ac" rel="nofollow">http://queri.ac</a> which has plenty more features:<p>* users can subscribe to public commands<p>* commands have optional query history<p>* public user, command, query pages<p>* command tagging<p>* commands have a powerful set of options, just like in a commandline, which map to url parameters: <a href="http://queri.ac/options_tutorial" rel="nofollow">http://queri.ac/options_tutorial</a><p>For more sites that have been doing web commands for years: <a href="http://delicious.com/tag/site:type=cmd" rel="nofollow">http://delicious.com/tag/site:type=cmd</a>