http://www.lego.com/eng/create/digitaldesigner/ Welcome to LEGO® Digital Designer! With Digital Designer, you can build anything in your imagination using virtual bricks, right on your computer. A new version of LEGO Digital Designer is now available: version 1.4. This version has increased stability and a brand new set of LEGO elements for you to build with. You can also print out an inventory of your creation and take it to any LEGOLAND theme park or LEGO Store and purchase the pieces you need to turn your virtual model into a reality! I'm just downloading this now. DOWNLOAD Link http://www.lego.com/eng/create/digitaldesigner/tracker.asp?os=mac Looks like fun and dual platform as well.