It's litigation game-playing at its best. I'm currently in a case where a third motion for summary judgment was just filed on the same facts in the same case. It happens. And yes, I spend a lot of time putting opposition motions together, as well. So long as your local rules don't prohibit multiple motions for summary judgment, then unfortunately this is permissible.
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I agree with the response above. Depending on the timing, you could bring a CCP 128.7 motion arguing that the MSJ is frivolous. However, these are extremely difficult to win.
This question comes up fairly frequently on Avvo. For a recent discussion see my answer, and others, here: http://www.avvo.com/legal-answers/is-it-normal-to-allow-a-second-motion-for-summary--1163070.html
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