Sources on the Web for Divrei Torah on Parshat Hashavuah

• Rabbi Shlomo Riskin: http://www.ots.org.il/
• Rabbi Jonathan Sacks: http://www.rabbisacks.org
  
• Project Genesis - Torah.Org (Rav Frand, Rav Mordechai Kamenetsky, Lifeline,and others): http://www.torah.org/
• Orthodox Union: http://www.ou.org/torah/index
• links to many sources including:
• The Tanach Study Center (Menachem Leibtag): http://www.tanach.org/
• Ohr Samayach: http://ohr.edu/new/
• Aish HaTorah: http://www.aish.com/tp/
• Shabbat B'Shabato/Zomet Institutet: http://www.zomet.org.il/eng
• and many many more
• Bar-Ilan University's Parashat Hashavua Study Center: http://www.biu.ac.il/JH/Parasha/eng/
• Machon Meir: http://www.machonmeir.net/english/
• Shamash: Divrei Torah (excellent searchable archive of older material): http://www.shamash.org/tanach/dvar.html
• Shemayisrael (Divrei Torah from several sources): http://www.shemayisrael.co.il/parsha/index.htm