Wow, we clearly got really lucky using a cab from Yellow Cab. I was on hold FOREVER to get a cab, but once I got someone, everything was good. We waited maybe 20 minutes for a cab to show up at our hotel to take us to Heinz Field.
The cab we got was clean, the driver was great, and they didn't gouge rates due to the playoff game (this is what happens in Dallas, where I live).
Sadly, I don't remember the driver's name... But he was great.