The following web sites, among many others, have commentary on the weekly Torah portion.

• Orthodox Union - Shabbat Learning Center
• Jewish Theological Seminary - (Conservative Movement) Torah from JTS
• Union of Reform Judaism - (Reform Movement) Reform Voices of Torah   
• Reconstructionist Movement - Divrei Torah
• Chabad - Parshah Archive
• Project Genesis  (Jewish education and outreach)
  American Jewish World Service - commentary with a focus on tikkun olam (repairing the world)