If you use Google's advanced options to restrict the search results to a certain period of time, you'll find that Google shows the date when each web page has been first indexed. In many cases, this is a good approximation of the date when a web page has been created. You can edit Google's URL to customize how fresh the search results should be. For example, if you append &as_qdr=y9 to Google's search URL, you'll restrict the results to web pages first indexed by Google in the last 9 years. Since this restriction should include all web pages from Google's index, you can use it to display the timestamp next to each search result e.g. search for iPod.
Maybe in the future Google will display the date next to each search result, it will try to approximate the date when a page has been created, allow users to filter results from certain periods and sort the results by date.
Google, Google Search, Web Search, Internet Search, Search Result, Indexing, Search Engine