I have attended MIS events [both general audit and IT audit] several times and found these to be well-done.
Another source I like is Canaudit [http://www.canaudit.com/]. I have attended several of their courses and found them excellent. Explore their website to see what is being offered and sign up for their e-newsletter.
I would caution against doing all of your IT audit in house. If you have LANs. WANs, multiple servers, mini-mainframes, internet banking, etc., etc., you will be hard-pressed to keep up with it all these days.
Another good website is http://www.theiia.org/itaudit/ . New articles every month relevant to IT audit.
The internet materials and emails from SANS Institute [http://www.sans.org/newlook/home.php] seem very good. I am attending the SANSFIRE2002 in Boston this month to learn how to audit firewalls.
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My opinions are not legal advice, not my employer's, and may change anytime.