The memo is an argument by Mr Douglas Feith that there was such a connection. It doesn't seem to be supported by others that would have read it. From what parts I have seen I don't think it's a case closed pile of information. It's important to keep in mind that the memo includes raw intelligence reports, that is information that has not be verified.
The memo includes the Muhammad Atta in Prague information, which has been widely questioned. Much of the rest of it seems to consists of information that somebody in al Qaeda met with somebody from Iraqs intelligence service with no information about what the topic was.
It was already known that Iraq and al Qaeda had talked to each other on and off for many years. But nothing has turned up that shows that their relation went very far.
Jay