Yesterday I took a taxi from south Central park area (west 57th) to LGA (Sunday morning was a great time, took only about 25 minutes). I paid, total, $37.00, including tip and toll (the toll was $4.15).
The driver did tell me that due to an accident we were taking a different bridge than one would normally.
Each taxi I took in NYC had a LED screen in the back; hit the 'map' button on the screen and you can follow your progress. Pretty neat.