Advanced Persistent Threats are probably the most remarkable events for Information Security in 2011 since they are redefining the infosec landscape from both technology and market perspective.
I consider the recent shopping in the SIEM arena made by IBM and McAfee a sign of the times and a demonstration of this trend. This is not a coincidence: as a matter of fact the only way to stop an APT before it reaches its goal (the Organization data), is an accurate analysis and correlation of data collected by security devices. An APT attack deploys different stages with different tactics, different techniques and different timeframes, which moreover affect different portion of the infrastructure. As a consequence an holistic view and an holistic information management are needed in order to correlate pieces of information spread in different pieces of the networks and collected by different, somewhat heterogeneous and apparently unrelated, security devices.