Either you text is just too long, the type is set up to be too big or you didn't set the brackets right see here: http://help.adobe.com/en_US/illustrator/cs/using/WS714a382cdf7d304e7e07d0100196cbc5f-63eca.html (Handling is the same in Version CS2) You can also move the left and right bracket, which is not mentioned on that page.
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