okay, i am REALLY glad that someone posted this..
so far, I have owned three subaru vehicles. ALL THREE of them have pulled to the left, even immediatley after a four-wheel alignment. I have to hold the steering wheel slightly to the right in my WRX, as i had to do in my SVX and my RX. I attribute it to wide wheels and uneven road surfaces, but it's annoying as hell. i'm considering taking the WRX to the dealership and seeing if they can do anything about it, because even though you're SUPPOSED to keep a hand on the wheel at all times, it would be nice to be able to take them away for a moment (on a straight stretch, of course) and not have to worry about the car veering into the oncoming lane..