lib/fixnum_extensions.rb

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# you can open up the FixNum class and
# add this method there (optional approach)
#
# renamed 'time_month' to 'months_ago'
class Fixnum
  def months_ago
    Time.now.months_ago(self)
  end
end

config/initializers/date_time_formats.rb

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# Rails 2.0+ gives you an initializers directory
# within the config/ directory that gets auto-loaded
# when Rails starts
#
# you can extend the built-in DATE_FORMATS constant
# to get rid of the strftime("...") all over the place
# (it's much more maintainable, too, because you only
# change it in one place)
ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!(
  :visual => "%B %Y",
  :for_params => "/%Y/%m"
)

app/helpers/application_helper.rb

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# by using returning, you can get rid of the explicit
# return at the end of your method
#
# note: Ruby automatically returns the last executed 
# line within a method, so even without 'returning', you
# don't need the explicit 'return ...'
def last_number_of_months(number)
  returning months = [] do
    number.times do |n|
      year, month = n.months_ago.year, n.months_ago.month
      months << link_to(n.months_ago.to_s(:visual), posts_path(:year => year, :month => month))
    end
    months.join '<br />'
  end
end

config/routes.rb

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# define a route that matches your desired route so you're not
# concat'ing the "/%Y/%m"
map.posts '/posts/:year/:month', 
  :controller => '...',
  :action => '...',
  :requirements => {
    # regex requirements on the year/month params
    :year  => /(19|20)\d\d/,
    :month => /[01]\d/
  }

# further, i recommend wrapping the link_to in list items,
# rather than joining by <br /> elements... something like...
#
# months << content_tag(:li, link_to(n.months_ago.to_s(:visual), posts_path(:year => year, :month => month))
#
# but of course, i don't know the full extent of your needs
#
# hope that helps...

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month.months.ago