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And within Webmaster, add a sitemap and resubmit it. That gives Google an indication that something has changed and they should recrawl. If you already have Webmaster and a sitemap, then just click on the "resubmit" button. They generally get to it within a few days and it's the closest way I know to "force" a crawl.

I'm noticing the same thing. All of our rankings took a huge dive in Bing and Yahoo while our Google rankings remained steady. Not sure what to make of it just yet so I'm researching the issue a bit to learn more and what I can too to rectify this.