I am a map geek. And I am a traffic geek. Back when I was doing my 45-mile (one way!) commute in the Bay Area, I would always check the Web obessively prior to leaving, listen to traffic reports while driving, even call the special TravInfo phone number. None of that was really effective, at least partially because there was no way to get an on-the-fly visual overview of what was going on once I actually hit the road. Not on my budget.
Until now, that is.