There've been quite a few articles on containers on LWN over the last few months; worth digging around there if you're interested. A couple of the more recent ones:

https://lwn.net/Articles/524952/ - Glauber Costa's talk on the state of containers at LinuxCon Europe 2012

https://lwn.net/Articles/536033/ - systemd containers; these follow on from a theme of containerizing whole distros rather than single apps