Renewing domains for multiple years can get you better search engine treatment. Think about it: search engines need to weed out fly by night sites that make up lower value search results. One way is to give preference to sites who register or renew for 5 years or 10 years, over a simple 1 year registration or renewal. Like all search engine optimization techniques, you don’t stake everything on one issue like this. Don’t fret if you just renewed for only a year, and don’t think that simply registering for 10 years, without any other involvement in your marketing, is a ticket to optimum search results – neither are true.