in the Model put :

   1  def to_param
   2    id.to_s+'-'+title.downcase.gsub(' ', '-')
   3  end
   4  # note - title to be replaced with relevant column name

so now instead of :

http://www.savantis.co.uk/savantis/blog_article/19

you would get :

www.savantis.co.uk/savantis/blog_article/19-friendly-urls-in-ruby-on-rails