Last year's first conference was a big success in my opinion. Videos are available at http://juliacon.org/2014/, although the speakers weren't mic'ed so the sound isn't so great - we'll be fixing that this year.
That's great, it was the only significant annoyance last time! Looking forward to see what people have been doing with this language last year.
To get "real work" done, I stuck with the 0.3 line. I've found it to be quite stable. Master is quite lively but should be settling down soon, at which point I'll migrate.
[1]: http://juliaopt.org
I would love to go if I were any where in the neighborhood. But alas I'm over a thousand miles away.