http://support.google.com/webmasters/bin/answer.py?hl=en&answer=35624
"Avoid keyword stuffing. It's sometimes helpful to have a few descriptive terms in the title, but there’s no reason to have the same words or phrases appear multiple times. A title like "Foobar, foo bar, foobars, foo bars" doesn't help the user, and this kind of keyword stuffing can make your results look spammy to Google and to users."
If we’ve detected that a particular result has one of the above issues with its title, we may try to generate an improved title from anchors, on-page text, or other sources.
Google's suggestion is basically what I said above:
If you're concerned about content in your title or snippet, you may want to double-check that this content doesn't appear on your site. If it doesn't, try searching Google.com for the title or snippet enclosed in quotation marks. This will display pages on the web that refer to your site using this text. If you contact these webmasters to request that they change their information about your site, any changes to their sites will be recognized by our crawler after we next crawl their pages.
In addition, John Mueller gave this advice in a post on one of Google's blogs:
"In general, when we run across titles that appear to be sub-optimal, we may choose to rewrite them in the search results. This could happen when the titles are particularly short, shared across large parts of your site or appear to be mostly a collection of keywords. One thing you can do to help prevent this is to make sure that your titles and descriptions are relevant, unique and compelling, without being "stuffed" with too much boilerplate text across your site."
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(Pretty much sounds like what I said but you thumbed me down for.)
