doesn't adding just one extended character like alt+60001 increase the dictionary size that must be searched with by enough to make them useful, it might be 6 characters for a single char, but if placed randomly in the password it does require the brute force hack to try characters of that style in several positions before matching your password.
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Link to this comment: http://www.securityfocus.com/comments/infocus/1554/563#563