Here's a very brief summary of how Stack Overflow DevDays 2011 will go down:
It'll be two days long.
It'll be sometime in September or October.
There will be a single track, so you never have to worry about choosing between two equally cool topics.
When we did DevDays 2009, the idea was to do some intensive, one hour programming tutorials on the kinds of topics that we thought a lot of programmers really wanted to learn, but didn't have a chance yet to use at work. Two years ago, the topics we tried to cover were jQuery, Python, iPhone development, ASP.NET MVC, Google App Engine, etc.
This year, we've got two days, so there'll be time for even more sessions. We'll also have time for deeper, more big-picture talks in between the tutorials.
What topics would you like to learn about at DevDays 2011? One topic per answer, please, and vote up all the ones you like.
UPDATE (April 21st) Thanks for all the feedback, ideas, and votes so far. Keep it coming! We are working on nailing down dates and venues. Soon, we will line up committees for each city responsible for lining up speakers and fleshing out the schedule: they'll use this input as guidance to set up an awesome program in each of the four venues.
In the meantime if you have other questions about DevDays or other discussion, please ask it as a separate question tagged devdays-2011, don't just leave a random fly-by comment in the comments.