Starting from June 2nd (yesterday), Google Finance announces it will have real-time Nasdaq stock quotes and update it's website every second. Before this announcement, it used to have a 15-20 minutes delay for stock quotes to be published on free online site like Google Finance or Yahoo Finance.
This pilot program from Nasdaq is not exclusive for Google, other companies like CNBC, The Wall Street Journal Digital Network, Xignite (Nasdaq Press Release) are involved too. I don't hold any stock but I think it's always good that there is more data available to the public.
A related news, Google Finance got Hong Kong Stock Exchange pricing data.