Search by Date at AltaVista and Google - Web Search Tip of the Day
"Recency" - as Eric Schmidt of Google rather clumsily calls it - is attracting the attention of the search companies. Unfortunately, timely search results are not just a matter of speeding up the crawling of specific sites. With rapidly changing content, it is hard for a standard crawler to recognize what is new against what has previously been extracted. Even if the frequency is increased.