You can view real-time traffic information on Google Maps! (Old UI)
Road Test 2c: TrafficWORKS vs INRIX, Bing Maps and Google Maps
TrafficWORKS real-time traffic information solutions for mobile phones is compared with primary competitors: Google Maps running on an G1 Android phone from T-Mobile, INRIX Pro running on an iPhone from Apple, and Bing Maps running on an HTC Tilt 2 from AT&T.