For the first time ever, Yahoo! is opening up its campus to outside developers for a series of seminars and activities called Hack Day, which takes place next Friday and Saturday, September 29 and 30. Yahoo! has had internal hack days for a while, but this is your opportunity to be on the campus (legally) and get to interact with some of the best developers in the world.
Before anyone asks, I will not be presenting at Hack Day. There are, however, several excellent seminars and workshops available (full schedule). I strongly encourage anyone who is capable of doing so to attend (sign up. I promise you’ll learn a lot.