yield_to_me.rb

@contents = Hash.new
@views    = Array.new

def content_for identifier, content = nil, &content_block
  @contents[identifier] = block_given? ? content_block.call : content
end

def run
  return false if @views.empty?

  view_wrapper do |identifier|
    @contents[identifier]
  end
  
  true
end

def view_wrapper
  @views.each do |view|
    puts eval(view)
  end
end

def add_view text
  @views << %Q{"#{text}"}
end

#-----

content_for :bob do
  "Little Bobby Fisher"
end

content_for :sally do
  "Little Sally Ride"
end

add_view '#{yield :bob} is so damn cool'
add_view '#{yield :sally} is so damn cool'

run

~output.rb

1.9.3 (Object#main):0 > run
Little Bobby Fisher is so damn cool
Little Sally Ride is so damn cool
=> true