What you say is very correct. The IRA for example was funded largely by Americans but armed by Gaddafi and the PLO - the armalites from US gun stores notwithstanding.
I don't accept that Bin Laden and Hussein worked in concert. There may have been limited contact based a limited joint aim (to hurt the US) but Al-Qaeda is as opposed to secular Arabs as it the West. Just as Irish Catholics were happy to accept weapons from a Muslim dictator when they both had a desire to harm the UK, so Saddam and Qaeda may have had limited contact.
But organised, working-hand-in-hand partnership? Not likely.
Your response shows you haven't read very many of the articles linked. As well, to believe there was no connection is to believe OBL merely was gossiping with ole Saddam when he warned Saddam that 9/11 was coming and Saddam published the information in his state-run newspaper.
The connection was actually established well enough in a federal court of law to get a judgement of $104 million awarded to the plaintiffs, with Iraq being one of the defendants.