Refresh the feeds more often than once every hour.

Unfortunately with the millions of feeds that Reader users subscribe to, it's not really feasible for us to refresh all feeds more often. However, we are looking into using technologies such as PubSubHubbub to get notifications of updates faster than a once-an-hour refresh. In the meantime, if there's a feed you suspect has new content, you can select it and use the "Refresh" button to force it to be crawled if it hasn't been recently.