If you search for a stock ticker symbol on Google, they have a link that takes you to a special frameset leading to the relevant pages at various financial sites such as Fool.com or Yahoo Finance.
From their special search help:
"Google’s financial information providers have been selected and ordered solely on the basis of their quality, based on factors including download speed, user interface, and functionality. Please note that Google is not affiliated with the financial information providers that are used."
05/15/03 update: Yahoo!’s Evolution (mentions various shortcuts to get maps, weather and so on).