home.html.haml

= render :partial => 'shared/feed_item', :collection => @feed_items
  .pagination
    = link_to_next_page @feed_items, "More", :remote => true

home.js.erb

$("div#microposts .feed-item:last").after(
  "<%= escape_javascript(render :partial => 'shared/feed_item', 
                                :collection => @feed_items) %>"

);

pages_controller.rb

class PagesController < ApplicationController
  respond_to :js, :html
  
  def home
    @title = "Home"
    if signed_in?
      @micropost = Micropost.new if signed_in?
      @feed_items = current_user.feed.page(params[:page]).per(1)
    end
    
    respond_with @feed_items
  end
end

pages_helper.rb

module PagesHelper  
  def link_to_next_page(scope, name, options = {}, &block)
    params = options.delete(:params) || {}
    param_name = options.delete(:param_name) || Kaminari.config.param_name
    link_to_unless scope.last_page?, name, params.merge(param_name => (scope.current_page + 1)), options.merge(:rel => 'next') do
      block.call if block
    end
  end
end