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Thanks!  I did see it disappear after I posted the question.  It's good to know that Roger crawls about 30 days or so.

I wouldn't worry. Open Site Explorer (though a great tool) isn't updated as often as we'd like because Moz simply doesn't have the crawl power that Google has at its disposal. Be patient and OSE will catch up. In the meantime you could compare the links in Google Webmaster Tools (Traffic > Links to your Site). However, this info isn't great either and doesn't drill down into the individual links in the way that OSE does.