It isn't available out of the UK legally, but...yeah, I found it online 20 minutes after it ended.
I loved the first episode. On first watch, it seemed to drag a bit with all the twist endings, but on the second watch, it moved a lot more quickly, and the way everything tied together, even the throwaway cases at the start, was sheer brilliance. One of the best things Moffat's written, and he's written a LOT of good things. Can't wait for next week.