This thread is a little old, this post is intended to end it on an informative note.
Locked rear-ends work for drag racing where maximum traction is needed and steering is not.
Locked rear-ends work for circle track racing where the rules don't allow limited-slip and traction is needed. You manange the tight/loose condition with tire stagger.
Detroit lockers/True-Trac type limited slips are great for corner entry as they are unlocked when there is no power being applied. Stagger is still important from the middle-off since the axles are now locked by the application of power.
You can get away with limited slip and lockers on the street so long as you are aware of how the device is going to behave.
The new elockers look like the way to go for street applications. Leave it unlocked for cruising, throw the switch when you stage up at the light. Just remember it isn't going to turn. Under power you will NOT turn the car, your street tires are very close to the same size (left/right rear).
You can believe me or not. I have experienced this problem on the track, it makes for a real long night.