This is great. It is really nice to see someone take the time and effort to create large usable dataset. Only the break through research and next big thing in neural nets seems to get all the attention. But an average Joe as no easy way of getting access to data sets.

I also like that they even leveraged stuff like "x for y hours" style videos on youtube. (Eg: Dog barking to 10 hours).

I remember Andrew Ng mention something about being able synthesize even more trainable data by using combination of data as noise. (Eg: Women talking + dog barking (as introduced noise)).

Good job google, keep it up. I wonder when I will see other major players publish large data sets? Maybe Microsoft is next?