http://www.globalsecurity.org/military/world/para/al-qaida.htm
The headquarters of al-Qaeda are not known anymore.
From 1991 to 1996, al-Qaeda worked out of Sudan.
From 1996 until the collapse of the Taliban in 2001, al-Qaeda operated out of Afghanistan and maintained its training camps there.
U.S. intelligence officials now think al-Qaeda's senior leadership is trying to regroup in lawless tribal regions just inside Pakistan, near the Afghan border, inside Pakistani cities or in Iran.
In May 2003, administration officials claimed that senior al-Qaeda figures were in Iran and urged Tehran to apprehend them. Sa'ad bin Laden, Usama bin Laden's son, in an October 2003 report, is said be among those in Iran.
Al-Qaeda has autonomous underground cells in some 100 countries, including the United States, officials say. Law enforcement has broken up al-Qaeda cells in the United Kingdom, the United States, Italy, France, Spain, Germany, Albania, Uganda, and elsewhere.
Strength
It is impossible to known precisely, due to the decentralized stucture of the organization. Al-Qaida may have several thousand members and associates. It trained over 5,000 militants in camps in Afghanistan since the late 1980s. It also serves as a focal point for a worldwide network that includes many Sunni Islamic extremist groups, some members of al-Gama'a al-Islamiyya, the Islamic Movement of Uzbekistan, and the Harakat ul-Mujahidin.
External Aid
Bin Laden, member of a billionaire family that owns the Bin Ladin Group construction empire, is said to have inherited tens of millions of dollars that he uses to help finance the group. Al-Qaida also maintains moneymaking front businesses, solicits donations from like-minded supporters, and illicitly siphons funds from donations to Muslim charitable organizations. US efforts to block al-Qaida funding has hampered al-Qaida's ability to obtain money.
Al-Qaida has cooperated with a number of known terrorist groups worldwide including:
Armed Islamic Group
Salafist Group for Call and Combat and the Armed Islamic Group
Egyptian Islamic Jihad (Egypt)
Al-Gama'a al-Islamiyya
Jamaat Islamiyya
The Libyan Islamic Fighting Group
Bayt al-Imam (Jordan)
Lashkar-e-Taiba and Jaish-e-Muhammad (Kashmir)
Asbat al Ansar
Hezbollah (Lebanon)
Al-Badar
Harakat ul Ansar/Mujahadeen
Al-Hadith
Harakat ul Jihad
Jaish Mohammed - JEM
Jamiat Ulema-e-Islam
Jamiat-ul-Ulema-e-Pakistan
Laskar e-Toiba - LET
Moro Islamic Liberation Front (the Philippines)
Abu Sayyaf Group (Malaysia, Philippines)
Al-Ittihad Al Islamiya - AIAI (Somalia)
Islamic Movement of Uzbekistan
Islamic Army of Aden (Yemen)
These groups share al-Qaeda's Sunni Muslim fundamentalist views. Some terror experts theorize that Al-Qaeda, after the loss of it Afghanistan base, may be increasingly reliant on sympathetic affiliates to carry out it agenda. Intelligence officials and terrorism experts also say that al-Qaeda has stepped up its cooperation on logistics and training with Hezbollah, a radical, Iran-backed Lebanese militia drawn from the minority Shiite strain of Islam.