Google has been tweaking their result pages, nothing much but still something that affects search results. One has to do with the text that comes with you search results and in this case Google is trying to show the true connection between the search results and the search phrase that you are using. The snippets are said to show more information in relation to your search term.
This is great when you are using more than three word search phrases. The main change has to do with the algorithm it self. According to Google the results should be more relevant to the search string you provide. How exaclly I am not sure.