edit: But more seriously, not to feed the troll or anything, but, the 'Sun has been doing this with zones for years! it proved all of this shit long ago!' is a little tired.
If you'd like to go deep on why people are interested and why this is catching on, let's have a chat. nick@docker.com.
That being said in re difference between Docker and LXC/Jails/Zones
* Docker is a whole platform, that makes containers easy to use and portable.
* We’ve added security, versioning etc...
* Our platform has an index of images, where they can be shared and downloaded.
* In addition to the index we offer image management functionality: creation, changes, storing, sharing, updating, etc of images...that at runtime, run inside containers
Hope this helps
Lame, eh?