I used the Fib retrace from the high of 112 on 11/22/06 to the recent low of 80.51 on 3/5. The support @ 81 was established back on 11/3/06 when it hit a high of 81.2. That then became support and has been successfully tested 3 more times that November and 5 times in March of this year.Strong support!
Ironic my limit order today was 83.5, didn't quite get there though, I thought there would be a huge down tick right before 4. A lot of dollars will start showing up at the 82 and 83's. Not just little retail fish like me either.