Here is an update to The Case For Invading Iraq And Removing Saddam Hussein From Power. (v.2.1)

Hat Tip to Chris Donohoe, Sua Sponte 75, NL207, and (**) for some of the descriptions & links.

I. Saddam was known to have WMD and used it in at least 3 separate situations.

1. S. Hussein used Chemical weapons in the Iran-Iraq War [answers.com]
2. Hussein used Chemical weapons vs. the Kurds in N. Iraq  [phrusa.org] and here  [Free Republic]
3. S. Hussein used Chemical weapons against the Sunnis in S. Iraq [Human Rights Watch]
4. Statements to the effect that Iraq had or was seeking WMD made by: President Clinton, Madeline Albright, Sandy BergerRep. Nancy Pelosi, Sen. Carl Levin, V.P. Al Gore.  Also see this for many of the same or similar remarks [Snopes & acsa.net]
5. Letter to Pres. Clinton, signed by: Sens. Carl Levin, Tom Daschle, John Kerry, & others 10-09-1998. [Snopes]
6. Letter to Pres. Bush, Signed by Sen. Bob Graham & others, Dec, 5, 2001.  [Snopes]

II. There is a long list of WMD, delivery systems, and banned conventional weapons found in Iraq

1. Various WMD/Weapons [WorldNet Daily]
2. Uranium in Iraq [Newsmax]
3. Uranium Enrichment Program [Newsmax]
4. Jordan - Foiled WMD Attack [MSNBC]
5. Sarin & Mustard Gas [Foxnews]
6. WMD hidden in Syria [Newsmax]
7. Iraqi commander confirms Iraq had WMD [American Thinker]
8. MiGs found buried in the sand [BBC]
9. Banned Missiles found [Foxnews]
10. Still More Banned Weapons found [WorldNet Daily]
11. Still More Banned Weapons found (part 2) [WorldNet Daily]
12. More WMD found in Iraq ! [Foxnews]
13. Unexamined Bunkers that may contain WMD [NY Sun]
14. UN Inspectors think WMD moved to Syria [World Tribune]
15. WMD Moved to Syria/Lebanon [WorldNet Daily]
16. Suspected ties between Saddam and the 2001 Anthrax ‘Attacks’
17. Iraqi Dissident Talks About WMD Moved to Syria [Free Republic]
18. Iraq Sulfur Mustard Gas Chemical Weapons Have High Quality After 12 years of Storage
19. Chemical Material Hidden Underground [Free Republic]
20. Highly Radioactive Atomic Neutron Device [Free Republic]
21. Request For 500 KG Of SODIUM CYANIDE A Precursor For A Chemical Weapon [Free Republic]
22. Plan To Produce Mobile Laboratories [Free Republic]
23. Procurement of 50,000 Aluminum Tubes That Can Be Used For URANIUM ENRICHMENT  [Free Republic]
24. Secret Nuclear Project [Free Republic]
25. Chemical Gear for The Chemical Group [Free Republic]
26. Chemical Platoon Still Exists And Active [Free Republic]
27. Saddam Met with his Nuclear Group IN 2002 [Free Republic]
28. Saddam was one year away from building a nuclear bomb [New York Times]
    

III. Saddam Hussein had a History of Aggression, attacking 5 other nations.

1. Attacked Iran: Iran-Iraq War [bartleby.com]
2. Attacked Kuwait: Gulf War [nti.org] (#3-5 are in this same link)
3. Attacked Saudi Arabia: Gulf War - previous to Desert Storm [nti.org]
4. Attacked Israel: Gulf War - previous to Desert Storm [nti.org]
5. Attacked Qatar: Gulf War [nti.org] 
6. Attacked Bahrain: Gulf War - previous to Desert Storm [CNN]

IV. Terrorists have been found in Iraq & there were numerous associations between Iraq & terrorists

1. Abu Nidal (Planned Rome Airport Machine Gun Massacre) [National Review]
2. Abu Abbas (Planned Achilia Lauro Hijacking) [CNN]
3. Terrorist Training Camp Found in Iraq [Foxnews]
4. Ayman al-Zawahiri (Al Quaida affiliated terrorist in Iraq) [CNN]
5. Former Iraqi Prime Minister admits Saddam ties with terrorists [Newsmax]
6. Iraq & Terrorists collaborated [NY Sun]
7. Al-Zarqawi harbored/protected by Saddam's regime [Kaleejtimes.com]
8. Zarqawi in Iraq Long Before the War Started [Free Republic]
9. Iraqi Intelligence met with Bin Laden in 1995 [Free Republic]
10. Saddam Regime Recruits Suicide Terrorists to Hit US Interests [Free Republic]
11. Saddam Orders The Arab Feedayeen Terrorists To Be Treated The Same As Iraqi Soldiers [Free Republic]
12. Iraqi Intelligence To Train Arab Feedayeen Terrorists In the Year 2000 [Free Republic]
13. Saddam Regime Training and Using Foreign Arab Terrorists As Suicide Bombers [Free Republic]
14. Afghani Taliban Consul Spoke of a Relationship Between Iraq and Bin Laden [Free Republic]
15. Saddam Ordered 25,000 Dollars for Each Suicide Terrorist Against Israel [Free Republic]
16. Iraqi Intelligence Asks Hamas To Conduct Terrorist Attacks Against The US [Free Republic]
17. Saddam's Terror Training Camps [Weekly Standard]
18. Interview of Sabah Kodada [PBS]
19. Salman Pak / Al Salman [GlobalSecurity.org]
20. Al-Qaida running new terror camp, say Kurds [Guardian]
21. Salman Pak - Iraq's Own Terrorist Training Camp

V. Other Casus Belli

1. Radar tracking & SA missiles fired upon "No Fly Zone" Aircraft - a violation of Gulf War surrender terms [cdi.org]
2. Assassination attempt on former President George Bush, Sr. [Washington Post]

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** My apologies to the person who originally posted items # 17-21 (section IV) on Newsbusters.  I cannot find your original post to get your nom de plume and give you a Hat Tip for finding these items.