It should be realtime (not delayed 20 minutes), we will find out in 8 minutes if this is true. :)
{
"ticker": "AAPL",
"exchange": "NASDAQ",
"price": "598.86",
"change": "-9.48",
"change_percent": "-1.56",
"last_trade_time": "Apr 19, 9:30AM EDT"
}EDIT: I guess a few of them are actually realtime now. Here's the list: http://www.google.com/intl/en/googlefinance/disclaimer/