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I saw this while browsing the Merb source code, and despite the bad variable names thought it was pretty nice:

module Enumerable
  def injecting(s)
    inject(s) do |k, i|
      yield(k, i); k
    end
  end
end

Use like:

['o', 'hai', 'rly', 'srsly'].injecting({}) {|accumulator, value| accumulator[value] = value.size} 
            # => {"srsly"=>5, "o"=>1, "hai"=>3, "rly"=>3}# => 10

Simple pleasures. I find it increasingly hard to live without things like this, Object#returning, and Symbol#to_proc as I start to use them. After all…