You can always look in the current Astronomy 2009 yearbook. They have the relative apparent size of the planets for each month. Lots of other good info as well.
Along the roads leading to Siding Spring are a set of planet billboards at 1/38000000 scale distances. They have models of the planets on them and some history. I have a set of photos I took on Saturday, except Pluto which I couldn't find at either Dubbo or Tamworth. But then it isn't a planet anymore.