If you do pick up a cab at Universal, be sure to get one using the official Taxi booth. The booth is to the right as you get off the escalators, can't miss it. There are some less scrupulous drivers that wander around that area picking up unsuspecting people and overcharging them (they're "hire cars" rather than taxi cabs - no meters).
We just got back last week, and it was normally 8.80 or so to get a ride with the official cabs to our hotel (Residence Inn Convention Center). Our friends grabbed one of the hire car people because they didn't want to wait in line at the booth and were charged 17.00 for the same ride.