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AIM actually runs over any port that you tell it to. For a while, I ran mine over port 13 (daytime port), or the finger port - just for fun. AIM is built to get around any and every firewall you have set up. Short of flat out blocking all traffic to AOL's netblock, you'll be very hard-pressed to stop AIM.
The best solution is an operating system/active directory solution, restricting the user's rights to install programs. Unless you're running in an Active Directory/XP Professional or Win2000 Professional environment, you'll be hard-pressed to set up effective policies. A user can always install AIM onto a USB memory stick at home and bring it in, plug in the memory stick, and off he goes.
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