I've scoured the known universe and the information on Smart Containers is still a bit sketchy.
There's a great post here: https://community.emc.com/docs/DOC-2489 that gives a good demo of what can be done - but other than that it's a bit sparse. There's information in the Composer User Guide on how to create a them - which get's you all excited (yes I am sad) and then doesn't really tell you what to do next.
My trustee EMC SE has informed that you should be able to instantiate a new smart container from inside webtop - similar to david's presentation - but I haven't had a chance to check it out yet. Can anybody confirm this? I will be building a 6.5 SP1 image soon so will have a look for myself. I also have an inkling that this functionality will be integral in the Case Management Framework announced at Momentum - and this could be why there is not much more detail.
If anybody can shed some further light, provide some real world usage examples, or just generally wants to moan about the lack of documentation around this interesting feature - please join in. Maybe people power will force the information to be released....
Cheers Niall