gistfile1.builder

# using Paginator with MongoMapper
# index action in a controller
 def index
    @pager = Paginator.new(User.count, 20) do |offset, per_page|
      User.all(:offset => offset, :limit => per_page, :order => "created_at DESC")
    end
    @users = @pager.page(params[:page])

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @users }
    end
  end

gistfile2.html

<!-- This should show page numbers, 1 2 3 ... with hyperlinks -->
<% (1..@users.number_of_pages).to_a.each do |p| %>
  <%= p == @users.number ? p : link_to(p, users_path(:page => p)) %>
<% end %>