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Sometimes Google is confused and shows similar snippets for blogs, especially if homepages look like search results pages.
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Google's snippets usually include one or more excerpts from the page that include some of your keywords and are separated by ellipses.
Update: It's official. "If a search result consists mostly of a structured list, like a table or series of bullets, we'll show a list of three relevant rows or items underneath the result in a bulleted format. The snippet will also show an approximate count of the total number of rows or items on the page," explains Google.