I'm a bit surprised that one hasn't been made on here already (unless I just haven't noticed it), so I decided to make my own bracket pool on Yahoo. This pool is open to anyone on geekhack. Just use the link below
https://yho.com/tourney?g=206757&k=7d5f3a509af41abfThe password is "geekhack"
Also, if you already have a bracket on Yahoo, you can enter it into multiple pools. I know this might be a little late, but the deadline to enter is tomorrow at 12PM EST. Good luck everyone!