This is an interesting question. It is true that Google+ pages (more accurately, Google Profiles) get indexed immediately. My sense, with about ten days of experience with the Google+ site that I have been working on, is that it is helping search results on Google. I need to check whether the same is happening on Bing and Yahoo. This may not be the result of blatant favouratism from Google. I am inclined to think that Google, from a competition/anti-trust perspective, has to be careful about favouring its own products in search results.
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