Ed Husain says the United States must engage the Arab world to defeat al-Qaeda.

Steven Cook, Senior Fellow for Middle Eastern Studies at the Council on Foreign Relations, expects that bin Laden's death will not have a significant impact on al-Qaeda or organizations like it. Extremist activity targeting countries in the Middle East and the United States is likely to continue, says Cook.

Elliott Abrams, Senior Fellow for Middle Eastern Studies at the Council on Foreign Relations, says that bin Laden's death helps the drive for democracy in the Middle East and weakens the influence of al-Qaeda in the Arab world.

Elliott Abrams discusses the importance of the timing of Osama bin Laden's death.

Mohamad Bazzi says that without a strong central state that can defend itself, Hizbollah remains the most powerful force in Lebanon.

A profile of the Lebanese terrorist organization.

Pakistan's latest moves to exert influence in Afghanistan, including possible brokering of talks with militant Taliban allies, could pose difficulties for U.S. stabilization efforts, says CFR's Daniel Markey.

Ties to Pakistan in the Times Square bomb case suggest a direct al-Qaeda influence on the goals of some of Pakistan's Taliban militants, says counterterrorism expert Brian Fishman.

Nicholas Schmidle discusses the growing--and murderous--divide between old and new guard jihadists in Pakistan.

Chechnya has been plagued by two wars and an ongoing insurgency since the fall of the Soviet Union. In recent years, Chechen militants have escalated attacks in the North Caucasus and revived bombings in Moscow.

The provisional Irish Republican Army, or IRA, is an outgrowth of an older group known as the Irish Republican Army, which fought an insurgency that successfully challenged British rule in the whole of Ireland in the early years of the twentieth century.

Lydia Khalil provides a guide to al-Qaeda's organization.

Lydia Khalil asks, "What, if anything, does an association with al-Qaeda mean today?"

Financial pressures have weakened al-Qaeda's tactical abilities, but analysts say affiliated networks are finding new ways to raise and spend money, complicating efforts to squeeze a savvy foe.

A profile of the Pakistani militant group India blames for some of the most severe terror attacks it has suffered in recent years, including the Mumbai assault of November 2008.

The Independent reports on hostility between the north and south in Yemen.

This BBC News profile discusses the history of Al-Qaeda in the Arabian Peninsula (AQAP).

The threat posed by the al-Qaeda-Taliban relationship is a crucial element in U.S. strategic planning in Afghanistan. Four experts explore the changing nature of these sometimes murky ties.