google ajax feed 看着似乎听好玩，是从 Feedfetcher 中拿 的feed，不是实时的，研究中…一会写个小例子。

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How Feeds are Crawled

The Google AJAX Feed API crawls feeds with Feedfetcher, which is also used for Google Reader and the Google personalized homepage. See the Google Webmaster Help Center for details on Feedfetcher.

Feed Crawl Frequency

As the Google AJAX Feed API uses Feedfetcher, feed data from the AJAX Feed API may not always be up to date. The Google feed crawler (”Feedfetcher”) retrieves feeds from most sites less than once every hour. Some frequently updated sites may be refreshed more often.