Yahoo! is getting in on the 'search as command line' act and has launched an open shortcut service following the lead set by YubNub, meaning you can create your own search commands and run them through their search engine.

Shortcuts take the form !SHORTCUTNAME and are mapped to a URL, which could be a normal website link or can also contain additional search parameters URL%$

For more info:  http://search.yahoo.com/osc/help