The three20 code has shuffled around a lot in the last 8 months or so, but if you look at the change log here http://github.com/facebook/three20/blob/master/CHANGES#L93 you can see that the maintainer, Jeff (who was a college student at the time and has worked his butt off on three20) is thanking a 3rd party for contributing that code.
There's attribution for other code in three20, so I think it's safe to say that Jeff didn't know.
It's also possible that there was simply a miscommunication somewhere along the chain. I wouldn't assume this is anyone being evil or devious until we hear the full story, and I expect the lack of attribution will be fixed quickly.
I was there two years ago, and it was easily the best conference I've attended. Can't recommend it enough.
What's the general atmosphere of the event?
It's intense (lots of content), and no-nonsense. Every speaker had something valuable to say, and they didn't talk down to the audience at all.
I found the day motivating, especially DHH's talk and just chatting with my peers. With the exception of one person, everyone I met was a hacker and was working on something.
Is it similar to other conferences you've attended?
Not really, one big difference: the overall quality of the attendees. I'm a shy person, but there were so many people talking about writing code (vs. big idea people) that I felt like I fit right in.
Is it simply a day-long sales pitch for YC?
The only real pitch-man the year I attended was Jeff Bezos, his talk was a pitch for AWS. However, he was so impressive during the Q&A that I can forgive him.
There's a new api for shake gestures in 3.0, your firstResponder needs to implement motion[Began|Cancelled|Ended]:withEvent. Works fine in the simulator.
Great story, and also gave me a flash of insight: when considering people to work with, "Would I plan a bank heist with this person?" isn't a half bad question to ask. It implies complete trust both in the person and their ability to perform.
(Or maybe I'm just goofy...when I can't put my finger on what's causing me to hesitate about a person or situation, off-the-wall questions/scenarios usually help me figure out what's really bothering me.)
That he gave Javascript another chance says more about him than his dismissal of it four years ago.
However: The Python community is the frostiest on the planet.
They're complete kneebiting buttheads to the last man.
I try hard not to conflate the merits of a programming language with its "community" (although sometimes that's damned hard to do), and it's made me a happier programmer.
(That said, I don't think I'd characterize the Python community as frosty or buttheads, either today or in 2004.)
Jack Sheridan's talk at startup school (http://omnisio.com/startupschool08/jack-sheridan, a good talk that's not a sales pitch) was an eye-opener for me -- I've become much more disciplined about simply documenting agreements.
Worth reading for some context.