The power of defaults - article on website search by Jakob Nielsen
In addition to the findings - that point our how important it is to be at the top of the results page - Jakob also talks about the content that appears on there:
...it's also important to have good microcontent to increase the likelihood that users will perceive your site as relevant to their needs. Good page titles and article summaries are a must.Which lead me to another article, full of useful advice on summarising your content effectively.
Microcontent: How to Write Headlines, Page Titles, and Subject Lines - article by Jakob Nielsen