Link: Google Finance.
Google Finance is in beta and it looks pretty useful. Type in Apple's symbol AAPL, for instance, and you get a lot of info at a glance, including recent blog entries. Very handy if you're into this sort of thing. The only thing missing as far as I can tell is there isn't an RSS feed available. Google News lets you subscribe to a feed of your specificied search terms... you'd think this would work the same way.