Largest CTF in the World: NYU-Poly CSAW CTF

DEFCON CTF teams with points: 303 (http://ddtek.biz/qualsDC20scoreboard.html)

CSAW CTF teams with points: 639

STRIPE CTF competitors: ~7,000

CSAW CTF competitors: ~9,100

Writeups are being posted in reddit.com/r/netsec:

http://raidersec.blogspot.com/2012/09/csaw-ctf-quals-2012-re...

http://blog.lse.epita.fr/articles/31-csaw-ctf-2012-exploitat...