 The purpose of this study is to evaluate the safety and tolerability of long-term administration of etanercept in adults with psoriasis who have participated in previous etanercept psoriasis studies. This study will also evaluate the maintenance of the efficacy of etanercept in adults with psoriasis who have participated in previous etanercept psoriasis studies. All subjects enrolled in this study will receive 50 mg once weekly or twice weekly if qualified after week 12 by subcutaneous injections for at least 48 weeks and up to 72 weeks. 