I've been poking at mine since last night, but have been unable to invite anyone else. :-(
I think if you're looking at the Circles page (https://plus.google.com/?tab=nX#circles ?), you can select the people who are "Other contacts" and Remove them... there's a Remove in the upper right of the screen (not in the black bar, but in the white area below that). The 'Remove' action may simply hide them rather than delete, but at least the addresses are not cluttering up the Circles interface then.
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Hrmm...
Date: 2011-07-02 03:38 am (UTC)I think if you're looking at the Circles page (https://plus.google.com/?tab=nX#circles ?), you can select the people who are "Other contacts" and Remove them... there's a Remove in the upper right of the screen (not in the black bar, but in the white area below that). The 'Remove' action may simply hide them rather than delete, but at least the addresses are not cluttering up the Circles interface then.