Have you seen this “live” Solar system simulator? Check out http://www.fourmilab.ch/cgi-bin/Solar — really cool!
And don’t try to keep refreshing it to see how the planets move 🙂 The scale of the simulation is small enough so you can just about see a diferrence from day to day. You can try playing with the dates and increase/decrease by a month though 😉 Even so, not too much movement from Pluto as you would expect — lazy git! 🙂 lol