The supplemental briefs ordered by the Supreme Court in Panetti v. Quarterman, No. 06-6407, have been filed. Our collection of briefs has been updated. The order, previously discussed here, called for briefing on the question of whether the habeas petition was "successive" within the meaning of 28 U.S.C. § 2244. The underlying question in the case is the standard for determining whether an inmate is mentally competent to be executed. The case will be argued April 18, a week from tomorrow.