|Actual station names may vary.|
In the mean time I've been playing with a piece of software called SCARM (Simple Computer Aided Railway Modeller). I've used a few other pieces of CAD software before for layouts, but nothing has come close to the simplicity and intuitive interface of SCARM. It's not a huge download, and easily translates your track plans into 3D (see screenshot above).
The best part is its huge track database, which includes PECO, the brand of track I'm using. You can also print off your designs to ease the construction of the layout. Simple and straightforward - just as software should be.