Vladimir has also made a number of contributions recently and is resposible for a small but important change of mind on my part about how accessing streams from different fibers/tasks is working. The outcome of this will be in the next version of vibe.d, which will be released shortly.

Anyway, have a look at the talk on youtube and see for yourself. Be sure not to miss the Q/A session at the end - it contains some interesting technical insights. There are also some accompanying discussions on reddit and the D newsgroup. And, of course, also check out the rest of the talks at DConf, there are some highly interesting technical topics and great introductions to various D features among them.