Yahoo Hack Day's Success & Yahoo Mail API Coming

It sounds like Yahoo's first open Hack Day was a big success, featuring even a performance by Beck. Yahoo's Bradley Horowitz has a nice roundup in Yahoo Open Hack Day: Hell Yes!. TechCrunch's Michael Arrington served at MC of the event, and All Women Team Takes Yahoo Hack Day Top Prize post covers the top winners, briefly. Meanwhile, Yahoo Mail introduces web APIs from Niall Kennedy covers how a new API for Yahoo Mail is coming, with commentary from others here on TechMeme.