Hi Matt,
Personaly I do not employ mailto links for this very reason and that I also think it is a hassel for a user to have to launch their email client when i can supply them with a form that will submit the email for them.
In any event, you will probably want to do some obfuscation such as described in this article:
http://www.december14.net/ways/js/nospam.shtml
hth.
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