Brain Lint notes that Google uses sparklines, "miniature graphs that go inline with text. In this case the graph is a histogram that indicates how much of the stock market falls into each part of the range - this will give one a quick preview how inclusive their search parameters are."
It looks much better than the stock screener from Yahoo Finance, which is anything but intuitive. Even if it looks outdated, Yahoo Finance has more features and content, so its user base won't migrate to Google Finance for the vivid charts and the clever integration of news headlines.
