.vimrc

" ,g  - create google a href for word under cursor
map ,g <Esc>Bm`:r!ghref <cword><CR>"gdd``i<C-R><C-R>g<esc>dwi<BackSpace><Esc>
vmap ,g yvgvdm`:r!ghref '<C-R>=substitute(@0, "['\n]", " ", "g")<cr>'<cr>"gdd``i<C-R><C-R>g<Esc>i<BackSpace><Esc>

gistfile2.rbx

#!/usr/bin/env ruby
require 'rubygems'
require 'curb'
require 'json'
str = ARGV.join(" ")
c = Curl::Easy.new("http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=#{URI.encode(str)}") {|curl| curl.headers["Referer"] = "http://tommorris.org/" } # Your favourite URI here!
c.perform
puts "<a href=\"" + JSON.parse(c.body_str)['responseData']['results'][0]['url'] + "\">" + str + "</a>"