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The way that Google views this sort of thing, is to ask yourself the following question: "Is everything different and needs to be on a different domain, or could it all be featured under just one?" And this is very true. Why do you have multiple domains? Was it to make the most of EMD (Exact Match Domains) or to try and gain more favour with Google? This is exactly how they view it. I always advise my clients in this boat to consolidate if the content across the sites is very similar. You then have to think about the visitors. Are there opportunities to cross-sell a product or service? You don't really want to be moving them between domains as this is bad for UX and trust. By what you have said here, I would probably be advising you to consolidate, but without knowing more, there could be exceptions. -Andy

Here is the penguin: http://www.seo-stories.com/post/21985421183/google-called-the-25th-april-2012-ranking-update