The title says it, Project Airbus released the little baby of the A320 family, the A318. You can grab it from their download section. There are a number of liveries, including Air France, Frontier, Airbus Demonstrator, and a sweet Global Jet (private/corporate) livery.
More after I get a chance to download it and spend some time with her. This should be great if it anything like their A320 or A319!
Update: Here are some screenshots of the baby-bus:
Now I have a major problem. What size Project Airbus do I fly? the Big (A320), the Medium (A319), or the baby (A318)?