Clearly, today's threat environment is multifaceted and rapidly changing. From zero-day exploits, client-side attacks and botnets, organizations are facing a maturing marketplace that encourages attackers to invest in better organization and tools. In turn, defenders need to keep learning from each other, sharing threat information and discussing effective defense strategies. This is the only way to ensure they do not fall behind in the cyberspace arms race that is unlikely to end any time soon.