OK so i just had this same problem ... AGAIN! I bought my car used last year in November and had this exact experience happen to me. I was getting on an on ramp from a dead stop at a stop light and my car started spinning out of control maybe going 25MPH. Luckily I slid into the grass and hit a hole so i only blew out my tire and no one was hurt. I took it to the dealer and they kept it for almost a MONTH~! gave it back and said my pads were worn out (3mm rear 5mm front) OK $2k and i'm safe right???? WRONG! Since then i have been religious with my brake inspections. I have it on record with the same dealer that my pads were 5mm rear and 9mm front on 11/3/2010 so that can not be the issue. I had them check it when i had them install a whole new set of tires all 4 brand new link to brand and type at bottom.
Last night 11/29/10 i was coming home and came to a stop light. Slowed down for the red but it turned green before a complete stop. About 50-60 feet down the road is a slight left hand turn. My back end came around for about a half second and then the car SNAPPED back to being straight no light no nothing me and my buddy laughed and continue to drive to our house which was less than a mile away. Right before my house there is a turn off camber and to the right. In the middle of this turn i had the same experience but this time it never let go. The back tires locked up with no brakes applied. This is the same experience i had described to the dealer last year when i bought the car but there was no evidence. How do i know it happened this time you may ask... the cars behind me stopped and told me! "Dude your back tires just stopped spinning and like half way around your brake lights came on" Slid across 2 lanes of on-coming traffic backwards, hit embankment (i was going so "fast" that that hitting a flat mud wall didn't ding or scratch my cars body panel even the tail lights are still together) and then ended up destroying my right rear wheel/tire on a curb. My suspension is completely screwed. Bent a ton of stuff and thats was just what i could see last night with a flashlight. Wheel and BRAND NEW TIRE (11/3/2010) are ruined. A chunk between two spokes was knocked out when i hit the curb. And the crazy thing is the Ford Explorer behind me made it through the same turn at the same speed no problems.

Stopped and came and helped me push my car. So what's going on?? Anyone else having this happen even on different wheels/smaller scale? I am almost scared to drive the car in turns now!
I fell in love with this car the day i saw the concept vehicle ... i guess like all true loves it will find a way to burn you LOL jk jk
Here is a link to the tires:
http://www.tirerack.com/tires/tires.jsp ... xclaim+UHP