I’m a heavy user of Yahoo Finance, in part because whenever you search for a ticker at Google, the first result is always a summary from Yahoo.
Charts can be changed to show stock activity for different time periods by clicking and dragging, and they can be zoomed in on to get more detailed information. News stories that correspond to specific days are displayed on the side and are automatically adjusted to reflect the selected time period.
Google Finance will become a strong ally for those looking to track their company reputation. Google will incorporate blog postings and forum discussions alongside mainstream news stories.