Not to demean Charlie's method, but I've heard that there is a way to take Yoshimo to Spellhold (even into the Asylum itself), and keep him afterwards.
You can Flesh to Stone him whenever you want, assuming you have a Wizard or a Bard. He's not in the party anymore, so he can't turn traitor, and he can't talk to you, so he can't go back to the Copper Coronet. After whipping Irenicus, a little Stone to Flesh action and some healing, Yoshimo's all ready again. (I wonder what he says to Jon in the final battle, though?)
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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