I loved Sim City right from the first version and enjoyed the various iterations since then. Well Cities XL is looking like a great little addition to the genre.
[Screenshots of CitiesXL via the official site]
Perhaps the most intriguing thing here is our growing capability to visualise in real-time vast urban environments with mutliple layers of complexity and data. I wonder when something like this might glue into the likes of Google Earth/Maps at some point as well.
Here is a trailer-like video showing off the engine, I like some of the shots showing vast shadows from large buildings arcing their way across huge freeways filled with cars on their way who knows where.